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<header> <nav aria-label="Breadcrumb"> <p><a href="/Sandboxes/johnnyphung/chem65/01:_Chapter_Notes/Chap_04#">Chemistry 65: Preparatory Chemistry</a> > <a href="/Sandboxes/johnnyphung/chem65/01:_Chapter_Notes/Chap_04#">Chapter Notes</a></p> </nav> <h1>Chap 04</h1> </header> <main role="main"> <div id="preview" class="preview scrollEditor"> <div id="container-ruller"></div> <div id="preview-content"> <h2 type="section" data-unnumbered="true" id="the-atomic-theory" class="section-title"> THE ATOMIC THEORY</h2> <div><figure style="text-align: center"><img src="https://cdn.mathpix.com/cropped/d9dca550-7f0d-4378-98ee-b8025409a8ca-01.jpg?height=559&width=407&top_left_y=380&top_left_x=146" alt="" data-align="center" /></figure></div> <ul> <li>The smallest particle of matter that still retains its properties is called an atom.</li> <li>In the fifth century B.C., the Greek philosopher Democritus proposed that matter is composed of a finite number of discrete particles, named atomos (meaning uncuttable or indivisible)</li> </ul> <h2 type="section" data-unnumbered="true" id="democritus" class="section-title"> Democritus</h2> <ul> <li>In 1808, John Dalton, built on ideas of Democritus, and formulated a precise definition of the building blocks of matter.</li> <li>Dalton's model represented the atom as a featureless ball of uniform density.</li> </ul> <div class="table" number="1"> <div class="figure_img" style="text-align: center;"><img src="https://cdn.mathpix.com/cropped/d9dca550-7f0d-4378-98ee-b8025409a8ca-01.jpg?height=665&width=454&top_left_y=930&top_left_x=1521" alt="" style="max-width: 100%;" /></div><div class="caption_figure">John Dalton</div></div> <ul> <li>This model is referred to as the "soccer ball" model.</li> </ul> <h2 type="section" data-unnumbered="true" id="dalton's-atomic-theory" class="section-title"> DALTON'S ATOMIC THEORY</h2> <ul> <li>Dalton's Atomic Theory consisted of three parts:</li> <li>Each element is composed of tiny indestructible particles called atoms.</li> <li>All atoms of a given element are similar to one another, but different from atoms of other elements.<br /> <figure style="text-align: center"><img src="https://cdn.mathpix.com/cropped/d9dca550-7f0d-4378-98ee-b8025409a8ca-02.jpg?height=462&width=571&top_left_y=666&top_left_x=734" alt="" data-align="center" /></figure></li> <li>Atoms combine in simple, whole-number ratios to form compounds.<br /> <figure style="text-align: center"><img src="https://cdn.mathpix.com/cropped/d9dca550-7f0d-4378-98ee-b8025409a8ca-02.jpg?height=390&width=596&top_left_y=1546&top_left_x=296" alt="" data-align="center" /></figure><br /> <figure style="text-align: center"><img src="https://cdn.mathpix.com/cropped/d9dca550-7f0d-4378-98ee-b8025409a8ca-02.jpg?height=349&width=663&top_left_y=1658&top_left_x=1155" alt="" data-align="center" /></figure></li> </ul> <h2 type="section" data-unnumbered="true" id="discovery-of-the-electron" class="section-title"> DISCOVERY OF THE ELECTRON</h2> <ul> <li>In 1897, J.J. Thomson performed experiments with a cathode ray tube. Negatively charged particles from cathode were pulled towards positively charged plate, anode, and allowed to pass through and be detected on a fluorescent screen.<br /> <figure style="text-align: center"><img src="https://cdn.mathpix.com/cropped/d9dca550-7f0d-4378-98ee-b8025409a8ca-03.jpg?height=654&width=1292&top_left_y=595&top_left_x=449" alt="" data-align="center" /></figure></li> <li>In absence of a magnetic field, the cathode rays were not deflected.</li> <li>In presence of a magnetic and electric fields, the cathode rays were deflected towards the positive plate, indicating a negative charge.</li> <li>The cathode rays were later named electrons.</li> <li>Based on these findings, Thomson proposed an atomic model composed of negatively charged electrons embedded in a uniform positively charged sphere.</li> <li>This model is called the "plum pudding" model.<br /> <figure style="text-align: center"><img src="https://cdn.mathpix.com/cropped/d9dca550-7f0d-4378-98ee-b8025409a8ca-03.jpg?height=441&width=497&top_left_y=1826&top_left_x=1422" alt="" data-align="center" /></figure></li> </ul> <h2 type="section" data-unnumbered="true" id="nuclear-model-of-the-atom" class="section-title"> NUCLEAR MODEL OF THE ATOM</h2> <ul> <li>In 1910, Ernest Rutherford carried out a number of experiments to further probe the nature of the atom.</li> <li>In these experiments he bombarded a thin sheet of gold foil with <span class="math-inline " data-overflow="visible"> <mjx-container class="MathJax" jax="SVG"><svg style="vertical-align: -0.018ex;" width="1.722ex" height="1.041ex" role="img" focusable="false" viewbox="0 -452 761 460"><g stroke="currentColor" fill="currentColor" stroke-width="0" transform="scale(1,-1)"><g data-mml-node="math"><g data-mml-node="mi"><path data-c="1D736" d="M39 166Q39 213 59 261T117 353T219 424T362 452Q420 452 466 433T536 384T573 325T586 269V265Q593 272 609 308T636 381Q640 397 644 399T669 402H680Q700 402 700 388Q700 379 691 351T659 276T604 188L593 173L595 153Q600 79 612 43H618Q634 45 642 51T653 64T658 71Q661 73 684 73Q712 73 712 59Q712 39 685 16T603 -7Q588 -7 575 -5T551 2T532 12T516 24T503 37T494 49T487 60T481 69L469 61Q362 -8 251 -8Q159 -8 99 36T39 166ZM260 43Q310 43 361 63T438 101T465 124Q458 240 453 277Q435 401 354 401Q291 401 245 355Q230 337 217 313Q201 279 186 216T170 126Q170 72 208 54Q230 43 260 43Z"></path></g></g></g></svg></mjx-container></span>-particles (large, positively charged) emitted from a radioactive source.<br /> <figure style="text-align: center"><img src="https://cdn.mathpix.com/cropped/d9dca550-7f0d-4378-98ee-b8025409a8ca-04.jpg?height=504&width=860&top_left_y=659&top_left_x=715" alt="" data-align="center" /></figure></li> <li>The majority of the particles were observed to pass through undeflected or slightly deflected.</li> <li>Some of the particles were observed to be deflected at large angles.</li> <li>Few of the particles were observed to be turned back towards the direction they came from.</li> <li>Thomson's model of the atom could not account for these results.<br /> <figure style="text-align: center"><img src="https://cdn.mathpix.com/cropped/d9dca550-7f0d-4378-98ee-b8025409a8ca-04.jpg?height=452&width=1292&top_left_y=1617&top_left_x=399" alt="" data-align="center" /></figure></li> <li>Based on these observations, Rutherford proposed a model of the atom consisting of a small, massive positive center (nucleus), surrounded by electrons in mostly empty space.</li> <li>This model is called the nuclear model.</li> </ul> <h2 type="section" data-unnumbered="true" id="the-structure-of-the-atom" class="section-title"> THE STRUCTURE OF THE ATOM</h2> <ul> <li>In 1932, James Chadwick discovered the existence of a second nuclear particle. This neutral particle was named neutron.</li> </ul> <h2 type="section" data-unnumbered="true" id="current-model-of-the-atom%3A" class="section-title"> Current Model of the Atom:</h2> <ul> <li>The atom is an electrically neutral spherical entity.</li> <li>It is composed of a positively charged center surrounded by negatively charged electrons.</li> <li>The electrons (e) move rapidly through the atomic volume, held by the attractive forces to the nucleus.</li> <li>The atomic nucleus consists of positively charged protons ( <span class="math-inline "> <mjx-container class="MathJax" jax="SVG"><svg style="vertical-align: -0.439ex;" width="2.792ex" height="2.193ex" role="img" focusable="false" viewbox="0 -775.2 1234.1 969.2"><g stroke="currentColor" fill="currentColor" stroke-width="0" transform="scale(1,-1)"><g data-mml-node="math"><g data-mml-node="msup"><g data-mml-node="mi"><path data-c="1D491" d="M24 296Q25 302 27 312T41 350T65 397T103 435T157 452Q235 452 273 404Q336 452 409 452Q434 452 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neutrons ( <span class="math-inline "> <mjx-container class="MathJax" jax="SVG"><svg style="vertical-align: -0.018ex;" width="2.601ex" height="1.905ex" role="img" focusable="false" viewbox="0 -833.9 1149.6 841.9"><g stroke="currentColor" fill="currentColor" stroke-width="0" transform="scale(1,-1)"><g data-mml-node="math"><g data-mml-node="msup"><g data-mml-node="mi"><path data-c="1D48F" d="M24 296Q25 302 27 312T41 350T65 397T104 435T159 452Q203 452 234 435Q268 419 285 384L293 391Q363 452 454 452Q575 446 597 367Q599 356 599 334Q599 285 562 183T522 66Q519 43 530 43Q557 43 582 69T621 138Q626 156 630 159T650 162H656H667Q687 162 687 148Q687 138 677 115T647 63T595 13T522 -8Q475 -8 439 16T402 82Q402 96 439 199T477 351Q477 401 434 401Q421 401 409 398Q341 388 285 305L278 295L247 170Q216 46 214 40Q206 22 187 7T143 -8T104 7T90 39Q90 47 108 124T146 274L164 347Q166 355 166 372Q166 401 149 401Q129 401 115 379T89 306Q84 288 80 285T55 282H44Q24 282 24 296Z"></path></g><g data-mml-node="TeXAtom" transform="translate(746,363) scale(0.707)" data-mjx-texclass="ORD"><g data-mml-node="mn"><path data-c="30" d="M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z"></path></g></g></g></g></g></svg></mjx-container></span> ).<br /> <figure style="text-align: center"><img src="https://cdn.mathpix.com/cropped/d9dca550-7f0d-4378-98ee-b8025409a8ca-05.jpg?height=532&width=740&top_left_y=560&top_left_x=1297" alt="" data-align="center" /></figure></li> <li>The modern atom consists of 3 subatomic particles:</li> </ul> <div class="table" number="1"> <div class="caption_table">TABLE 4.1 Subatomic Particles</div><div class="table_tabular" style="text-align: center"> <div class="inline-tabular"><table class="tabular"> <tbody> <tr style="border-top: none !important; border-bottom: none !important;"> <td style="text-align: left; border-left: none !important; border-right: none !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top-style: solid !important; border-top-width: 1px !important; width: auto; vertical-align: middle; " class="_empty"></td> <td style="text-align: left; border-right: none !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top-style: solid !important; border-top-width: 1px !important; width: auto; vertical-align: middle; ">Mass <span class="math-inline "> <mjx-container class="MathJax" jax="SVG"><svg style="vertical-align: -0.566ex;" width="4.434ex" height="2.262ex" role="img" focusable="false" viewbox="0 -750 1960 1000"><g stroke="currentColor" fill="currentColor" stroke-width="0" transform="scale(1,-1)"><g data-mml-node="math"><g data-mml-node="mo"><path data-c="28" d="M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z"></path></g><g data-mml-node="TeXAtom" data-mjx-texclass="ORD" transform="translate(389,0)"><g data-mml-node="mi"><path data-c="1D424" d="M32 686L123 690Q214 694 215 694H221V255L377 382H346V444H355Q370 441 476 441Q544 441 556 444H562V382H476L347 277L515 62H587V0H579Q564 3 476 3Q370 3 352 0H343V62H358L373 63L260 206L237 189L216 172V62H285V0H277Q259 3 157 3Q46 3 37 0H29V62H98V332Q98 387 98 453T99 534Q99 593 97 605T83 620Q69 624 42 624H29V686H32Z"></path></g><g data-mml-node="mi" transform="translate(607,0)"><path data-c="1D420" d="M50 300Q50 368 105 409T255 450Q328 450 376 426L388 420Q435 455 489 455Q517 455 533 441T554 414T558 389Q558 367 544 353T508 339Q484 339 471 354T458 387Q458 397 462 400Q464 401 461 400Q459 400 454 399Q429 392 427 390Q454 353 459 328Q461 315 461 300Q461 240 419 202Q364 149 248 149Q185 149 136 172Q129 158 129 148Q129 105 170 93Q176 91 263 91Q273 91 298 91T334 91T366 89T400 85T432 77T466 64Q544 22 544 -69Q544 -114 506 -145Q438 -201 287 -201Q149 -201 90 -161T30 -70Q30 -58 33 -47T42 -27T54 -13T69 -1T82 6T94 12T101 15Q66 57 66 106Q66 151 90 187L97 197L89 204Q50 243 50 300ZM485 403H492Q491 404 488 404L485 403V403ZM255 200Q279 200 295 206T319 219T331 242T335 268T336 300Q336 337 333 352T317 380Q298 399 255 399Q228 399 211 392T187 371T178 345T176 312V300V289Q176 235 194 219Q215 200 255 200ZM287 -150Q357 -150 400 -128T443 -71Q443 -65 442 -61T436 -50T420 -37T389 -27T339 -21L308 -20Q276 -20 253 -20Q190 -20 180 -20T156 -26Q130 -38 130 -69Q130 -105 173 -127T287 -150Z"></path></g></g><g data-mml-node="mo" transform="translate(1571,0)"><path data-c="29" d="M60 749L64 750Q69 750 74 750H86L114 726Q208 641 251 514T294 250Q294 182 284 119T261 12T224 -76T186 -143T145 -194T113 -227T90 -246Q87 -249 86 -250H74Q66 -250 63 -250T58 -247T55 -238Q56 -237 66 -225Q221 -64 221 250T66 725Q56 737 55 738Q55 746 60 749Z"></path></g></g></g></svg></mjx-container></span></td> <td style="text-align: left; border-right: none !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top-style: solid !important; border-top-width: 1px !important; width: auto; vertical-align: middle; ">Mass <span class="math-inline "> <mjx-container class="MathJax" jax="SVG"><svg style="vertical-align: -0.566ex;" width="6.638ex" height="2.262ex" role="img" focusable="false" viewbox="0 -750 2934 1000"><g stroke="currentColor" fill="currentColor" stroke-width="0" transform="scale(1,-1)"><g data-mml-node="math"><g data-mml-node="mo"><path data-c="28" d="M94 250Q94 319 104 381T127 488T164 576T202 643T244 695T277 729T302 750H315H319Q333 750 333 741Q333 738 316 720T275 667T226 581T184 443T167 250T184 58T225 -81T274 -167T316 -220T333 -241Q333 -250 318 -250H315H302L274 -226Q180 -141 137 -14T94 250Z"></path></g><g data-mml-node="TeXAtom" 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style="text-align: left; border-right: none !important; border-bottom: none !important; border-top: none !important; width: auto; vertical-align: middle; ">1.0087</td> <td style="text-align: left; border-bottom: none !important; border-top: none !important; width: auto; vertical-align: middle; ">0</td> </tr> <tr style="border-top: none !important; border-bottom: none !important;"> <td style="text-align: left; border-left: none !important; border-right: none !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">electron</td> <td style="text-align: left; border-right: none !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; "><span class="math-inline "> <mjx-container class="MathJax" jax="SVG"><svg style="vertical-align: -0.05ex;" width="15.477ex" height="2.02ex" role="img" 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0T168 40Q168 198 265 368Q285 400 349 489L395 552H302Q128 552 119 546Q113 543 108 522T98 479L95 458V455H55V458Z" transform="translate(500,0)"></path></g></g></g></g></g></svg></mjx-container></span></td> <td style="text-align: left; border-right: none !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">0.00055</td> <td style="text-align: left; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; "><span class="math-inline "> <mjx-container class="MathJax" jax="SVG"><svg style="vertical-align: -0.186ex;" width="2.891ex" height="1.692ex" role="img" focusable="false" viewbox="0 -666 1278 748"><g stroke="currentColor" fill="currentColor" stroke-width="0" transform="scale(1,-1)"><g data-mml-node="math"><g data-mml-node="mn"><path data-c="31" d="M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z"></path></g><g data-mml-node="mo" transform="translate(500,0)"><path data-c="2212" d="M84 237T84 250T98 270H679Q694 262 694 250T679 230H98Q84 237 84 250Z"></path></g></g></g></svg></mjx-container></span></td> </tr> </tbody> </table> </div></div> </div> <h2 type="section" data-unnumbered="true" id="mass-relationships-in-the-atom%3A" class="section-title"> Mass Relationships in the Atom:</h2> <ul> <li>The number of protons in an atom determines its identity, and is called atomic number (Z).</li> <li>In a neutral atom, the number of protons (+) are equal to the number of electrons ( - ).</li> <li>Almost all the mass of the atom rests in the nucleus.<br /> <figure style="text-align: center"><img src="https://cdn.mathpix.com/cropped/d9dca550-7f0d-4378-98ee-b8025409a8ca-05.jpg?height=272&width=609&top_left_y=1759&top_left_x=1344" alt="" data-align="center" /></figure></li> <li>The number of protons and neutrons in an atom is called the mass number (A).</li> <li>The number of neutrons in an atom can be determined by the difference between mass number (A) and atomic number (Z):</li> </ul> <div><span class="math-block "> <mjx-container class="MathJax" jax="SVG" display="true"><svg style="vertical-align: -2.188ex;" width="49.708ex" height="5.507ex" role="img" focusable="false" viewbox="0 -1467 21971 2433.9"><g stroke="currentColor" fill="currentColor" stroke-width="0" transform="scale(1,-1)"><g data-mml-node="math"><g data-mml-node="mtable"><g data-mml-node="mtr" transform="translate(0,717)"><g data-mml-node="mtd"><g data-mml-node="mi"><path data-c="23" d="M56 347Q56 360 70 367H313L355 524Q394 676 401 686Q406 694 416 694Q434 694 436 676Q436 672 396 522Q355 374 355 369L354 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8Z"></path></g></g></g></g></g></g></svg></mjx-container></span></div> <h2 type="section" data-unnumbered="true" id="elements-%5C%26-the-periodic-table" class="section-title"> ELEMENTS & THE PERIODIC TABLE</h2> <ul> <li>The number of protons in an atom identify it as a particular element, and is called atomic number.</li> <li>Elements are arranged on the periodic table according to their atomic number.<br /> <figure style="text-align: center"><img src="https://cdn.mathpix.com/cropped/d9dca550-7f0d-4378-98ee-b8025409a8ca-06.jpg?height=274&width=566&top_left_y=373&top_left_x=1353" alt="" data-align="center" /></figure></li> <li>Over time some elements have been named for planets, mythological figures, minerals, colors, geographic locations and famous people. Some examples are shown below:</li> </ul> <div class="table_tabular" style="text-align: center"> <div class="inline-tabular"><table class="tabular"> <tbody> <tr style="border-top: none !important; border-bottom: none !important;"> <td style="text-align: left; border-left-style: solid !important; border-left-width: 1px !important; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top-style: solid !important; border-top-width: 1px !important; width: auto; vertical-align: middle; ">Element</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top-style: solid !important; border-top-width: 1px !important; width: auto; vertical-align: middle; ">Source of Name</td> </tr> <tr style="border-top: none !important; border-bottom: none !important;"> <td style="text-align: left; border-left-style: solid !important; border-left-width: 1px !important; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Uranium</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">The planet Uranus</td> </tr> <tr style="border-top: none !important; border-bottom: none !important;"> <td style="text-align: left; border-left-style: solid !important; border-left-width: 1px !important; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Titanium</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Titans (mythology)</td> </tr> <tr style="border-top: none !important; border-bottom: none !important;"> <td style="text-align: left; border-left-style: solid !important; border-left-width: 1px !important; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Chlorine</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Chloros, "greenishyellow"(Greek)</td> </tr> <tr style="border-top: none !important; border-bottom: none !important;"> <td style="text-align: left; border-left-style: solid !important; border-left-width: 1px !important; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Iodine</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Ioeides, "violet" (Greek)</td> </tr> <tr style="border-top: none !important; border-bottom: none !important;"> <td style="text-align: left; border-left-style: solid !important; border-left-width: 1px !important; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Magnesium</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Magnesia, a mineral</td> </tr> <tr style="border-top: none !important; border-bottom: none !important;"> <td style="text-align: left; border-left-style: solid !important; border-left-width: 1px !important; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Californium</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">California</td> </tr> <tr style="border-top: none !important; border-bottom: none !important;"> <td style="text-align: left; border-left-style: solid !important; border-left-width: 1px !important; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Curium</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Marie and Pierre Curie</td> </tr> </tbody> </table> </div></div> <ul> <li>The symbol for most elements is the one- or two-letter abbreviation of the name of the element. Only the first letter of an elements symbol is capitalized. If the symbol has a second letter, it is written as lowercase.</li> </ul> <pre><code class="hljs">Co (cobalt) CO(carbon and oxygen) </code></pre> <ul> <li>Although most of the symbols use letters from current names, some of the symbols of the elements are based on their Latin names.</li> </ul> <pre><code class="hljs">K potassium (kalium) Na sodium (natrium) Fe iron (ferrum) </code></pre> <ul> <li>Some elements have formulas that are not single atoms. Seven of these elements have diatomic (2-atoms) molecules.</li> </ul> <div class="table_tabular" style="text-align: center"> <div class="inline-tabular"><table class="tabular"> <tbody> <tr style="border-top: none !important; border-bottom: none !important;"> <td style="text-align: left; border-left: none !important; border-right: none !important; border-bottom: none !important; border-top: none !important; width: auto; vertical-align: middle; ">Hydrogen</td> <td style="text-align: center; border-right: none !important; border-bottom: none !important; border-top: none !important; width: auto; vertical-align: middle; "><span class="math-inline "> <mjx-container class="MathJax" jax="SVG"><svg style="vertical-align: -0.339ex;" width="2.685ex" height="1.885ex" role="img" focusable="false" viewbox="0 -683 1186.6 833"><g stroke="currentColor" fill="currentColor" stroke-width="0" transform="scale(1,-1)"><g data-mml-node="math"><g data-mml-node="msub"><g data-mml-node="TeXAtom" data-mjx-texclass="ORD"><g data-mml-node="mi"><path data-c="48" d="M128 622Q121 629 117 631T101 634T58 637H25V683H36Q57 680 180 680Q315 680 324 683H335V637H302Q262 636 251 634T233 622L232 500V378H517V622Q510 629 506 631T490 634T447 637H414V683H425Q446 680 569 680Q704 680 713 683H724V637H691Q651 636 640 634T622 622V61Q628 51 639 49T691 46H724V0H713Q692 3 569 3Q434 3 425 0H414V46H447Q489 47 498 49T517 61V332H232V197L233 61Q239 51 250 49T302 46H335V0H324Q303 3 180 3Q45 3 36 0H25V46H58Q100 47 109 49T128 61V622Z"></path></g></g><g data-mml-node="TeXAtom" transform="translate(783,-150) scale(0.707)" data-mjx-texclass="ORD"><g data-mml-node="mn"><path data-c="32" d="M109 429Q82 429 66 447T50 491Q50 562 103 614T235 666Q326 666 387 610T449 465Q449 422 429 383T381 315T301 241Q265 210 201 149L142 93L218 92Q375 92 385 97Q392 99 409 186V189H449V186Q448 183 436 95T421 3V0H50V19V31Q50 38 56 46T86 81Q115 113 136 137Q145 147 170 174T204 211T233 244T261 278T284 308T305 340T320 369T333 401T340 431T343 464Q343 527 309 573T212 619Q179 619 154 602T119 569T109 550Q109 549 114 549Q132 549 151 535T170 489Q170 464 154 447T109 429Z"></path></g></g></g></g></g></svg></mjx-container></span></td> <td style="text-align: left; border-right: none !important; border-bottom: none !important; border-top: none !important; width: auto; vertical-align: middle; ">Chlorine</td> <td style="text-align: center; border-bottom: none !important; border-top: none !important; width: auto; vertical-align: middle; "><span class="math-inline "> <mjx-container class="MathJax" jax="SVG"><svg style="vertical-align: -0.339ex;" width="3.25ex" height="1.934ex" role="img" focusable="false" viewbox="0 -705 1436.6 855"><g stroke="currentColor" fill="currentColor" stroke-width="0" transform="scale(1,-1)"><g data-mml-node="math"><g data-mml-node="msub"><g data-mml-node="TeXAtom" data-mjx-texclass="ORD"><g data-mml-node="mi"><path data-c="43" d="M56 342Q56 428 89 500T174 615T283 681T391 705Q394 705 400 705T408 704Q499 704 569 636L582 624L612 663Q639 700 643 704Q644 704 647 704T653 705H657Q660 705 666 699V419L660 413H626Q620 419 619 430Q610 512 571 572T476 651Q457 658 426 658Q322 658 252 588Q173 509 173 342Q173 221 211 151Q232 111 263 84T328 45T384 29T428 24Q517 24 571 93T626 244Q626 251 632 257H660L666 251V236Q661 133 590 56T403 -21Q262 -21 159 83T56 342Z"></path><path data-c="6C" d="M42 46H56Q95 46 103 60V68Q103 77 103 91T103 124T104 167T104 217T104 272T104 329Q104 366 104 407T104 482T104 542T103 586T103 603Q100 622 89 628T44 637H26V660Q26 683 28 683L38 684Q48 685 67 686T104 688Q121 689 141 690T171 693T182 694H185V379Q185 62 186 60Q190 52 198 49Q219 46 247 46H263V0H255L232 1Q209 2 183 2T145 3T107 3T57 1L34 0H26V46H42Z" transform="translate(722,0)"></path></g></g><g data-mml-node="TeXAtom" transform="translate(1033,-150) scale(0.707)" data-mjx-texclass="ORD"><g data-mml-node="mn"><path data-c="32" d="M109 429Q82 429 66 447T50 491Q50 562 103 614T235 666Q326 666 387 610T449 465Q449 422 429 383T381 315T301 241Q265 210 201 149L142 93L218 92Q375 92 385 97Q392 99 409 186V189H449V186Q448 183 436 95T421 3V0H50V19V31Q50 38 56 46T86 81Q115 113 136 137Q145 147 170 174T204 211T233 244T261 278T284 308T305 340T320 369T333 401T340 431T343 464Q343 527 309 573T212 619Q179 619 154 602T119 569T109 550Q109 549 114 549Q132 549 151 535T170 489Q170 464 154 447T109 429Z"></path></g></g></g></g></g></svg></mjx-container></span></td> </tr> <tr style="border-top: none !important; border-bottom: none !important;"> <td style="text-align: left; border-left: none !important; border-right: none !important; border-bottom: none !important; border-top: none !important; width: auto; vertical-align: middle; ">Oxygen</td> <td style="text-align: center; border-right: none !important; border-bottom: none !important; border-top: none !important; width: auto; vertical-align: middle; "><span class="math-inline "> <mjx-container class="MathJax" jax="SVG"><svg style="vertical-align: -0.339ex;" width="2.748ex" height="1.934ex" role="img" focusable="false" viewbox="0 -705 1214.6 855"><g stroke="currentColor" fill="currentColor" stroke-width="0" transform="scale(1,-1)"><g data-mml-node="math"><g data-mml-node="msub"><g data-mml-node="TeXAtom" data-mjx-texclass="ORD"><g data-mml-node="mi"><path data-c="4F" d="M56 340Q56 423 86 494T164 610T270 680T388 705Q521 705 621 601T722 341Q722 260 693 191T617 75T510 4T388 -22T267 3T160 74T85 189T56 340ZM467 647Q426 665 388 665Q360 665 331 654T269 620T213 549T179 439Q174 411 174 354Q174 144 277 61Q327 20 385 20H389H391Q474 20 537 99Q603 188 603 354Q603 411 598 439Q577 592 467 647Z"></path></g></g><g data-mml-node="TeXAtom" transform="translate(811,-150) scale(0.707)" data-mjx-texclass="ORD"><g data-mml-node="mn"><path data-c="32" d="M109 429Q82 429 66 447T50 491Q50 562 103 614T235 666Q326 666 387 610T449 465Q449 422 429 383T381 315T301 241Q265 210 201 149L142 93L218 92Q375 92 385 97Q392 99 409 186V189H449V186Q448 183 436 95T421 3V0H50V19V31Q50 38 56 46T86 81Q115 113 136 137Q145 147 170 174T204 211T233 244T261 278T284 308T305 340T320 369T333 401T340 431T343 464Q343 527 309 573T212 619Q179 619 154 602T119 569T109 550Q109 549 114 549Q132 549 151 535T170 489Q170 464 154 447T109 429Z"></path></g></g></g></g></g></svg></mjx-container></span></td> <td style="text-align: left; border-right: none !important; border-bottom: none !important; border-top: none !important; width: auto; vertical-align: middle; ">Fluorine</td> <td style="text-align: center; border-bottom: none !important; border-top: none !important; width: auto; vertical-align: middle; "><span class="math-inline "> <mjx-container class="MathJax" jax="SVG"><svg style="vertical-align: -0.339ex;" width="2.465ex" height="1.878ex" role="img" focusable="false" viewbox="0 -680 1089.6 830"><g stroke="currentColor" fill="currentColor" stroke-width="0" transform="scale(1,-1)"><g data-mml-node="math"><g data-mml-node="msub"><g data-mml-node="TeXAtom" data-mjx-texclass="ORD"><g data-mml-node="mi"><path data-c="46" d="M128 619Q121 626 117 628T101 631T58 634H25V680H582V676Q584 670 596 560T610 444V440H570V444Q563 493 561 501Q555 538 543 563T516 601T477 622T431 631T374 633H334H286Q252 633 244 631T233 621Q232 619 232 490V363H284Q287 363 303 363T327 364T349 367T372 373T389 385Q407 403 410 459V480H450V200H410V221Q407 276 389 296Q381 303 371 307T348 313T327 316T303 317T284 317H232V189L233 61Q240 54 245 52T270 48T333 46H360V0H348Q324 3 182 3Q51 3 36 0H25V46H58Q100 47 109 49T128 61V619Z"></path></g></g><g data-mml-node="TeXAtom" transform="translate(686,-150) scale(0.707)" data-mjx-texclass="ORD"><g data-mml-node="mn"><path data-c="32" d="M109 429Q82 429 66 447T50 491Q50 562 103 614T235 666Q326 666 387 610T449 465Q449 422 429 383T381 315T301 241Q265 210 201 149L142 93L218 92Q375 92 385 97Q392 99 409 186V189H449V186Q448 183 436 95T421 3V0H50V19V31Q50 38 56 46T86 81Q115 113 136 137Q145 147 170 174T204 211T233 244T261 278T284 308T305 340T320 369T333 401T340 431T343 464Q343 527 309 573T212 619Q179 619 154 602T119 569T109 550Q109 549 114 549Q132 549 151 535T170 489Q170 464 154 447T109 429Z"></path></g></g></g></g></g></svg></mjx-container></span></td> </tr> <tr style="border-top: none !important; border-bottom: none !important;"> <td style="text-align: left; border-left: none !important; border-right: none !important; border-bottom: none !important; border-top: none !important; width: auto; vertical-align: middle; ">Nitrogen</td> <td style="text-align: center; border-right: none !important; border-bottom: none !important; border-top: none !important; width: auto; vertical-align: middle; "><span class="math-inline "> <mjx-container class="MathJax" jax="SVG"><svg style="vertical-align: -0.339ex;" width="2.685ex" height="1.885ex" role="img" focusable="false" viewbox="0 -683 1186.6 833"><g stroke="currentColor" fill="currentColor" stroke-width="0" transform="scale(1,-1)"><g data-mml-node="math"><g data-mml-node="msub"><g data-mml-node="TeXAtom" data-mjx-texclass="ORD"><g data-mml-node="mi"><path data-c="4E" d="M42 46Q74 48 94 56T118 69T128 86V634H124Q114 637 52 637H25V683H232L235 680Q237 679 322 554T493 303L578 178V598Q572 608 568 613T544 627T492 637H475V683H483Q498 680 600 680Q706 680 715 683H724V637H707Q634 633 622 598L621 302V6L614 0H600Q585 0 582 3T481 150T282 443T171 605V345L172 86Q183 50 257 46H274V0H265Q250 3 150 3Q48 3 33 0H25V46H42Z"></path></g></g><g data-mml-node="TeXAtom" transform="translate(783,-150) scale(0.707)" data-mjx-texclass="ORD"><g data-mml-node="mn"><path data-c="32" d="M109 429Q82 429 66 447T50 491Q50 562 103 614T235 666Q326 666 387 610T449 465Q449 422 429 383T381 315T301 241Q265 210 201 149L142 93L218 92Q375 92 385 97Q392 99 409 186V189H449V186Q448 183 436 95T421 3V0H50V19V31Q50 38 56 46T86 81Q115 113 136 137Q145 147 170 174T204 211T233 244T261 278T284 308T305 340T320 369T333 401T340 431T343 464Q343 527 309 573T212 619Q179 619 154 602T119 569T109 550Q109 549 114 549Q132 549 151 535T170 489Q170 464 154 447T109 429Z"></path></g></g></g></g></g></svg></mjx-container></span></td> <td style="text-align: left; border-right: none !important; border-bottom: none !important; border-top: none !important; width: auto; vertical-align: middle; ">Bromine</td> <td style="text-align: center; border-bottom: none !important; border-top: none !important; width: auto; vertical-align: middle; "><span class="math-inline "> <mjx-container class="MathJax" jax="SVG"><svg style="vertical-align: -0.339ex;" width="3.476ex" height="1.885ex" role="img" focusable="false" viewbox="0 -683 1536.6 833"><g stroke="currentColor" fill="currentColor" stroke-width="0" transform="scale(1,-1)"><g data-mml-node="math"><g data-mml-node="msub"><g data-mml-node="TeXAtom" data-mjx-texclass="ORD"><g data-mml-node="mi"><path data-c="42" d="M131 622Q124 629 120 631T104 634T61 637H28V683H229H267H346Q423 683 459 678T531 651Q574 627 599 590T624 512Q624 461 583 419T476 360L466 357Q539 348 595 302T651 187Q651 119 600 67T469 3Q456 1 242 0H28V46H61Q103 47 112 49T131 61V622ZM511 513Q511 560 485 594T416 636Q415 636 403 636T371 636T333 637Q266 637 251 636T232 628Q229 624 229 499V374H312L396 375L406 377Q410 378 417 380T442 393T474 417T499 456T511 513ZM537 188Q537 239 509 282T430 336L329 337H229V200V116Q229 57 234 52Q240 47 334 47H383Q425 47 443 53Q486 67 511 104T537 188Z"></path><path data-c="72" d="M36 46H50Q89 46 97 60V68Q97 77 97 91T98 122T98 161T98 203Q98 234 98 269T98 328L97 351Q94 370 83 376T38 385H20V408Q20 431 22 431L32 432Q42 433 60 434T96 436Q112 437 131 438T160 441T171 442H174V373Q213 441 271 441H277Q322 441 343 419T364 373Q364 352 351 337T313 322Q288 322 276 338T263 372Q263 381 265 388T270 400T273 405Q271 407 250 401Q234 393 226 386Q179 341 179 207V154Q179 141 179 127T179 101T180 81T180 66V61Q181 59 183 57T188 54T193 51T200 49T207 48T216 47T225 47T235 46T245 46H276V0H267Q249 3 140 3Q37 3 28 0H20V46H36Z" transform="translate(708,0)"></path></g></g><g data-mml-node="TeXAtom" transform="translate(1133,-150) scale(0.707)" data-mjx-texclass="ORD"><g data-mml-node="mn"><path data-c="32" d="M109 429Q82 429 66 447T50 491Q50 562 103 614T235 666Q326 666 387 610T449 465Q449 422 429 383T381 315T301 241Q265 210 201 149L142 93L218 92Q375 92 385 97Q392 99 409 186V189H449V186Q448 183 436 95T421 3V0H50V19V31Q50 38 56 46T86 81Q115 113 136 137Q145 147 170 174T204 211T233 244T261 278T284 308T305 340T320 369T333 401T340 431T343 464Q343 527 309 573T212 619Q179 619 154 602T119 569T109 550Q109 549 114 549Q132 549 151 535T170 489Q170 464 154 447T109 429Z"></path></g></g></g></g></g></svg></mjx-container></span></td> </tr> <tr style="border-top: none !important; border-bottom: none !important;"> <td style="text-align: left; border-left: none !important; border-right: none !important; border-bottom: none !important; border-top: none !important; width: auto; vertical-align: middle; " class="_empty"></td> <td style="text-align: center; border-right: none !important; border-bottom: none !important; border-top: none !important; width: auto; vertical-align: middle; " class="_empty"></td> <td style="text-align: left; border-right: none !important; border-bottom: none !important; border-top: none !important; width: auto; vertical-align: middle; ">Iodine</td> <td style="text-align: center; border-bottom: none !important; border-top: none !important; width: auto; vertical-align: middle; "><span class="math-inline " data-overflow="visible"> <mjx-container class="MathJax" jax="SVG"><svg style="vertical-align: -0.339ex;" width="1.804ex" height="1.885ex" role="img" focusable="false" viewbox="0 -683 797.6 833"><g stroke="currentColor" fill="currentColor" stroke-width="0" transform="scale(1,-1)"><g data-mml-node="math"><g data-mml-node="msub"><g data-mml-node="TeXAtom" data-mjx-texclass="ORD"><g data-mml-node="mi"><path data-c="49" d="M328 0Q307 3 180 3T32 0H21V46H43Q92 46 106 49T126 60Q128 63 128 342Q128 620 126 623Q122 628 118 630T96 635T43 637H21V683H32Q53 680 180 680T328 683H339V637H317Q268 637 254 634T234 623Q232 620 232 342Q232 63 234 60Q238 55 242 53T264 48T317 46H339V0H328Z"></path></g></g><g data-mml-node="TeXAtom" transform="translate(394,-150) scale(0.707)" data-mjx-texclass="ORD"><g data-mml-node="mn"><path data-c="32" d="M109 429Q82 429 66 447T50 491Q50 562 103 614T235 666Q326 666 387 610T449 465Q449 422 429 383T381 315T301 241Q265 210 201 149L142 93L218 92Q375 92 385 97Q392 99 409 186V189H449V186Q448 183 436 95T421 3V0H50V19V31Q50 38 56 46T86 81Q115 113 136 137Q145 147 170 174T204 211T233 244T261 278T284 308T305 340T320 369T333 401T340 431T343 464Q343 527 309 573T212 619Q179 619 154 602T119 569T109 550Q109 549 114 549Q132 549 151 535T170 489Q170 464 154 447T109 429Z"></path></g></g></g></g></g></svg></mjx-container></span></td> </tr> </tbody> </table> </div></div> <h2 type="section" data-unnumbered="true" id="elements-%5C%26-the-periodic-table-2" class="section-title"> ELEMENTS & THE PERIODIC TABLE</h2> <ul> <li>Arrangement of elements based on their atomic masses was first proposed by the Russian chemist, Dmitri Mendeleev in 1869.</li> <li>The elements are generally classified as metals, nonmetals and metalloids.</li> </ul> <div class="table_tabular" style="text-align: center"> <div class="inline-tabular"><table class="tabular"> <tbody> <tr style="border-top: none !important; border-bottom: none !important;"> <td style="text-align: left; border-left-style: solid !important; border-left-width: 1px !important; border-right-style: solid !important; border-right-width: 1px !important; border-bottom: none !important; border-top: none !important; width: auto; border-top-style: solid !important; border-top-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; " rowspan="3">1</td> <td style="text-align: left; border-left-style: solid !important; border-left-width: 1px !important; border-right-style: solid !important; border-right-width: 1px !important; border-bottom: none !important; border-top: none !important; border-top-style: solid !important; border-top-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; " colspan="2"><div class="inline-tabular sub-table"><table class="tabular"> <tbody> <tr style="border-top: none !important; border-bottom: none !important;"> <td style="text-align: left; border-left: none !important; border-bottom: none !important; border-top: none !important; width: auto; vertical-align: middle; ">1A</td> </tr> <tr style="border-top: none !important; border-bottom: none !important;"> <td style="text-align: left; border-left: none !important; border-bottom: none !important; border-top: none !important; width: auto; vertical-align: middle; ">1</td> </tr> </tbody> </table> </div></td> <td style="text-align: center; border-left-style: solid !important; border-left-width: 1px !important; border-right-style: solid !important; border-right-width: 1px !important; border-bottom: none !important; border-top: none !important; width: auto; border-top-style: solid !important; border-top-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; " colspan="2" rowspan="5"></td> <td style="text-align: left; border-left-style: solid !important; border-left-width: 1px !important; border-right-style: solid !important; border-right-width: 1px !important; border-bottom: none !important; border-top: none !important; width: auto; border-top-style: solid !important; border-top-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; " rowspan="5"></td> <td style="text-align: left; border-left-style: solid !important; border-left-width: 1px !important; border-right-style: solid !important; border-right-width: 1px !important; border-bottom: none !important; border-top: none !important; vertical-align: bottom; width: auto; border-top-style: solid !important; border-top-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; " rowspan="5">6B</td> <td style="text-align: center; border-left-style: solid !important; border-left-width: 1px !important; border-right-style: solid !important; border-right-width: 1px !important; border-bottom: none !important; border-top: none !important; vertical-align: top; width: auto; border-top-style: solid !important; border-top-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; " colspan="4" rowspan="4"><div class="inline-tabular sub-table"><table class="tabular"> <tbody> <tr style="border-top: none !important; border-bottom: none !important;"> <td style="text-align: left; border-left: none !important; border-bottom: none !important; border-top: none !important; width: auto; vertical-align: middle; ">Metals □ Nonmetals</td> </tr> <tr style="border-top: none !important; border-bottom: none !important;"> <td style="text-align: left; border-left: none !important; border-bottom: none !important; border-top: none !important; width: auto; vertical-align: middle; ">Metalloids</td> </tr> </tbody> </table> </div></td> <td style="text-align: center; border-left-style: solid !important; border-left-width: 1px !important; border-right-style: solid !important; border-right-width: 1px !important; border-bottom: none !important; border-top: none !important; width: auto; border-top-style: solid !important; border-top-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; " colspan="2" rowspan="4"></td> <td style="text-align: left; border-left-style: solid !important; border-left-width: 1px !important; border-right-style: solid !important; border-right-width: 1px !important; border-bottom: none !important; border-top: none !important; vertical-align: bottom; width: auto; border-top-style: solid !important; border-top-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; " rowspan="3"><div class="inline-tabular sub-table"><table class="tabular"> <tbody> <tr style="border-top: none !important; border-bottom: none !important;"> <td style="text-align: left; border-left: none !important; border-bottom: none !important; border-top: none !important; width: auto; vertical-align: middle; ">3A</td> </tr> <tr style="border-top: none !important; border-bottom: none !important;"> <td style="text-align: left; border-left: none !important; border-bottom: none !important; border-top: none !important; width: auto; vertical-align: middle; ">13</td> </tr> </tbody> </table> </div></td> <td style="text-align: left; border-left-style: solid !important; border-left-width: 1px !important; border-right-style: solid !important; border-right-width: 1px !important; border-bottom: none !important; border-top: none !important; vertical-align: bottom; width: auto; border-top-style: solid !important; border-top-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; " rowspan="2">4A</td> <td style="text-align: left; border-left-style: solid !important; border-left-width: 1px !important; border-right-style: solid !important; border-right-width: 1px !important; border-bottom: none !important; border-top: none !important; vertical-align: bottom; width: auto; border-top-style: solid !important; border-top-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; " rowspan="2">5A</td> <td style="text-align: center; border-left-style: solid !important; border-left-width: 1px !important; border-right-style: solid !important; border-right-width: 1px !important; border-bottom: none !important; border-top: none !important; border-top-style: solid !important; border-top-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; " colspan="2"></td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top-style: solid !important; border-top-width: 1px !important; width: auto; vertical-align: middle; " class="_empty"></td> </tr> <tr style="border-top: none !important; border-bottom: none !important;"> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">1</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">2A</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">6A</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">7A</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">2</td> </tr> <tr style="border-top: none !important; border-bottom: none !important;"> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">H</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">2</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">14</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">15</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">16</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">17</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">He</td> </tr> <tr style="border-top: none !important; border-bottom: none !important;"> <td style="text-align: left; border-left-style: solid !important; border-left-width: 1px !important; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">2</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">3 Li</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">4 Be</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">5 B</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">C</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">N</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">0</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">9</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Ne</td> </tr> <tr style="border-top: none !important; border-bottom: none !important;"> <td style="text-align: left; border-left-style: solid !important; border-left-width: 1px !important; border-right-style: solid !important; border-right-width: 1px !important; border-bottom: none !important; border-top: none !important; vertical-align: top; width: auto; border-bottom-style: solid !important; border-bottom-width: 1px !important; " rowspan="2">3</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">11</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">12</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; " class="_empty"></td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; " class="_empty"></td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; " class="_empty"></td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; " class="_empty"></td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">1B</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">2B</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">13</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">14</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">15</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">16</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">17</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">18</td> </tr> <tr style="border-top: none !important; border-bottom: none !important;"> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Na</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Mg</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; " class="_empty"></td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; " class="_empty"></td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">5</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">6</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">7</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">8</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">9</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">10</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">11</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">12</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Al</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Si</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">P</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">S</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Cl</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Ar</td> </tr> <tr style="border-top: none !important; border-bottom: none !important;"> <td style="text-align: left; border-left-style: solid !important; border-left-width: 1px !important; border-right-style: solid !important; border-right-width: 1px !important; border-bottom: none !important; border-top: none !important; width: auto; border-bottom-style: solid !important; border-bottom-width: 1px !important; " rowspan="2">4</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">19</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">20</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">2122</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; " class="_empty"></td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">23</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">24</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">25</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">26</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">27</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">28</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">29</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">30</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">31</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">32</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">33</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">34</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">35</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">36</td> </tr> <tr style="border-top: none !important; border-bottom: none !important;"> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">K</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Ca</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Sc</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Ti</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">V</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Cr</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Mn</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Fe</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Co</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Ni</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Cu</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Zn</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Ga</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Ge</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">As</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Se</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Br</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Kr</td> </tr> <tr style="border-top: none !important; border-bottom: none !important;"> <td style="text-align: left; border-left-style: solid !important; border-left-width: 1px !important; border-right-style: solid !important; border-right-width: 1px !important; border-bottom: none !important; border-top: none !important; vertical-align: top; width: auto; border-bottom-style: solid !important; border-bottom-width: 1px !important; " rowspan="2">5</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">37</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">38</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">39</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">40</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">41</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">42</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">43</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">44</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">45</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">46</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">47</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">48</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">49</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">50</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">51</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">52</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">53</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">54</td> </tr> <tr style="border-top: none !important; border-bottom: none !important;"> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Rb</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Sr</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Y</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Zr</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Nb</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Mo</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Tc</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Ru</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Rh</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Pd</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Ag</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Cd</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">In</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Sn</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Sb</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Te</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">I</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Xe</td> </tr> <tr style="border-top: none !important; border-bottom: none !important;"> <td style="text-align: left; border-left-style: solid !important; border-left-width: 1px !important; border-right-style: solid !important; border-right-width: 1px !important; border-bottom: none !important; border-top: none !important; width: auto; border-bottom-style: solid !important; border-bottom-width: 1px !important; " rowspan="2">6</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; " class="_empty"></td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">56</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">57</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">72</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">73</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">74</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">75</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">76</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">77</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">78</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">79</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">80</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">81</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">82</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">83</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">84</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">85</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">86</td> </tr> <tr style="border-top: none !important; border-bottom: none !important;"> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">55 Cs</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Ba</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">La</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">5</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Ta</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">W</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Re</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Os</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Ir</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Pt</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Au</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Hg</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; " class="_empty"></td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Pb</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Bi</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Po</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">At</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Rn</td> </tr> <tr style="border-top: none !important; border-bottom: none !important;"> <td style="text-align: left; border-left-style: solid !important; border-left-width: 1px !important; border-right-style: solid !important; border-right-width: 1px !important; border-bottom: none !important; border-top: none !important; width: auto; border-bottom-style: solid !important; border-bottom-width: 1px !important; " rowspan="2">7</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">87 Fr</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">88 Ra</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">89 Ac</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">104 Rf</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">105</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">106</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">107</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">108</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">109</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">110</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">111</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">112</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">113</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">114</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">115</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">116</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">117</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">118</td> </tr> <tr style="border-top: none !important; border-bottom: none !important;"> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; " class="_empty"></td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; " class="_empty"></td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; " class="_empty"></td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; " class="_empty"></td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Db</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Sg</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Bh</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Hs</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Mt</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Ds</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Rg</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Cn</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; " class="_empty"></td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; " class="_empty"></td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; " class="_empty"></td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; " class="_empty"></td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; " class="_empty"></td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; " class="_empty"></td> </tr> <tr style="border-top: none !important; border-bottom: none !important;"> <td style="text-align: left; border-left-style: solid !important; border-left-width: 1px !important; border-right-style: solid !important; border-right-width: 1px !important; border-bottom: none !important; border-top: none !important; width: auto; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; " rowspan="3"></td> <td style="text-align: center; border-left-style: solid !important; border-left-width: 1px !important; border-right-style: solid !important; border-right-width: 1px !important; border-bottom: none !important; border-top: none !important; width: auto; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; " colspan="2" rowspan="3"></td> <td style="text-align: center; border-left-style: solid !important; border-left-width: 1px !important; border-right-style: solid !important; border-right-width: 1px !important; border-bottom: none !important; border-top: none !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; " colspan="2">Lanthanides</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">58</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">59</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Nd</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Pm</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Sm</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Eu</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Gd</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Tb</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Dy</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Ho</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">68</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Tm</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Yb</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">71</td> </tr> <tr style="border-top: none !important; border-bottom: none !important;"> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; " class="_empty"></td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; " class="_empty"></td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">90</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">91</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">92</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">93</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">94</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">95</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">96</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">97</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">98</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">99</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">100</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">101</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">102</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">103</td> </tr> <tr style="border-top: none !important; border-bottom: none !important;"> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; " class="_empty"></td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Actinides</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Th</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Pa</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">U</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Np</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Pu</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Am</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Cm</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Bk</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Cf</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Es</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Fm</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Md</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">No</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Lr</td> </tr> </tbody> </table> </div></div> <div>**Element 117 is currently under review by IUPAC.<br /> © 2015 Pearson Education, Inc.</div> <div class="table_tabular" style="text-align: center"> <div class="inline-tabular"><table class="tabular"> <tbody> <tr style="border-top: none !important; border-bottom: none !important;"> <td style="text-align: center; border-left-style: solid !important; border-left-width: 1px !important; border-right-style: solid !important; border-right-width: 1px !important; border-bottom: none !important; border-top: none !important; border-top-style: solid !important; border-top-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; " colspan="1">Metals</td> <td style="text-align: center; border-left: none !important; border-right-style: solid !important; border-right-width: 1px !important; border-bottom: none !important; border-top: none !important; border-top-style: solid !important; border-top-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; " colspan="1">Nonmetals</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top-style: solid !important; border-top-width: 1px !important; width: auto; vertical-align: middle; " class="_empty"></td> </tr> <tr style="border-top: none !important; border-bottom: none !important;"> <td style="text-align: left; border-left-style: solid !important; border-left-width: 1px !important; border-right: none !important; border-bottom: none !important; border-top: none !important; width: auto; vertical-align: middle; ">1.</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom: none !important; border-top: none !important; width: auto; vertical-align: middle; ">Mostly solid</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom: none !important; border-top: none !important; width: auto; vertical-align: middle; ">1. Can be solid, liquid or gas</td> </tr> <tr style="border-top: none !important; border-bottom: none !important;"> <td style="text-align: left; border-left-style: solid !important; border-left-width: 1px !important; border-right: none !important; border-bottom: none !important; border-top: none !important; width: auto; vertical-align: middle; ">2.</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom: none !important; border-top: none !important; width: auto; vertical-align: middle; ">Have shiny appearance</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom: none !important; border-top: none !important; width: auto; vertical-align: middle; ">2. Have dull appearance</td> </tr> <tr style="border-top: none !important; border-bottom: none !important;"> <td style="text-align: left; border-left-style: solid !important; border-left-width: 1px !important; border-right: none !important; border-bottom: none !important; border-top: none !important; width: auto; vertical-align: middle; ">3. Good conductors of heat and</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom: none !important; border-top: none !important; width: auto; vertical-align: middle; ">3. Poor conductors of heat and electricity</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom: none !important; border-top: none !important; width: auto; vertical-align: middle; " class="_empty"></td> </tr> <tr style="border-top: none !important; border-bottom: none !important;"> <td style="text-align: left; border-left-style: solid !important; border-left-width: 1px !important; border-right: none !important; border-bottom: none !important; border-top: none !important; width: auto; vertical-align: middle; " class="_empty"></td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom: none !important; border-top: none !important; width: auto; vertical-align: middle; ">electricity</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom: none !important; border-top: none !important; width: auto; vertical-align: middle; ">4. Are brittle (if solid)</td> </tr> <tr style="border-top: none !important; border-bottom: none !important;"> <td style="text-align: left; border-left-style: solid !important; border-left-width: 1px !important; border-right: none !important; border-bottom: none !important; border-top: none !important; width: auto; vertical-align: middle; ">4. Are malleable and ductile</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom: none !important; border-top: none !important; width: auto; vertical-align: middle; ">5. Gain or share electrons in a chemical</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom: none !important; border-top: none !important; width: auto; vertical-align: middle; " class="_empty"></td> </tr> <tr style="border-top: none !important; border-bottom: none !important;"> <td style="text-align: left; border-left-style: solid !important; border-left-width: 1px !important; border-right: none !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">5. Lose electrons in a chemical reaction</td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; " class="_empty"></td> <td style="text-align: left; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">reaction</td> </tr> </tbody> </table> </div></div> <ul> <li>Metalloids are elements that possess some properties of metals and some of non-metals. The most important metalloids are silicon (Si) and germanium (Ge) which are used extensively in computer chips.</li> </ul> <h2 type="section" data-unnumbered="true" id="elements-%5C%26-the-periodic-table-3" class="section-title"> ELEMENTS & THE PERIODIC TABLE</h2> <ul> <li>The periodic table is composed of periods (rows) and groups or families (columns).</li> <li>Elements in the same family have similar properties, and are commonly referred to by their traditional names.<br /> <figure style="text-align: center"><img src="https://cdn.mathpix.com/cropped/d9dca550-7f0d-4378-98ee-b8025409a8ca-08.jpg?height=854&width=1507&top_left_y=614&top_left_x=311" alt="" data-align="center" /></figure></li> </ul> <div>Copyright © 2009 Pearson Prentice Hall, Inc.</div> <ul> <li>Elements in groups 1-2 and 13-18 are referred to as main-group or representative elements.</li> <li>Group 1 elements are called alkali metal. These are soft metals that are very reactive, and often react explosively with other elements.</li> <li>Group 8 elements are called noble gases. These are un-reactive gases that are commonly used in light bulbs.</li> <li>Group 7 elements are called halogens. These are the most reactive nonmetals, and occur in nature only as compounds.</li> <li>Group 2 elements are called alkaline-earth metals. These metals are less reactive than alkali metals.</li> <li>The group of metals in-between the main group elements are called the transition metals.</li> </ul> <h2 type="section" data-unnumbered="true" id="formation-of-ions" class="section-title"> FORMATION OF IONS</h2> <ul> <li>When reacting, atoms often lose or gain electrons to form charged particles, called ions.</li> <li>For example, when reacting, lithium atom (3 protons and 3 electrons) loses one electron to form a <span class="math-inline "> <mjx-container class="MathJax" jax="SVG"><svg style="vertical-align: 0;" width="3.475ex" height="1.86ex" role="img" focusable="false" viewbox="0 -822.3 1536.1 822.3"><g stroke="currentColor" fill="currentColor" stroke-width="0" transform="scale(1,-1)"><g data-mml-node="math"><g data-mml-node="msup"><g data-mml-node="TeXAtom" data-mjx-texclass="ORD"><g data-mml-node="mi"><path data-c="4C" d="M128 622Q121 629 117 631T101 634T58 637H25V683H36Q48 680 182 680Q324 680 348 683H360V637H333Q273 637 258 635T233 622L232 342V129Q232 57 237 52Q243 47 313 47Q384 47 410 53Q470 70 498 110T536 221Q536 226 537 238T540 261T542 272T562 273H582V268Q580 265 568 137T554 5V0H25V46H58Q100 47 109 49T128 61V622Z"></path><path data-c="69" d="M69 609Q69 637 87 653T131 669Q154 667 171 652T188 609Q188 579 171 564T129 549Q104 549 87 564T69 609ZM247 0Q232 3 143 3Q132 3 106 3T56 1L34 0H26V46H42Q70 46 91 49Q100 53 102 60T104 102V205V293Q104 345 102 359T88 378Q74 385 41 385H30V408Q30 431 32 431L42 432Q52 433 70 434T106 436Q123 437 142 438T171 441T182 442H185V62Q190 52 197 50T232 46H255V0H247Z" transform="translate(625,0)"></path></g></g><g data-mml-node="TeXAtom" transform="translate(936,410.1) scale(0.707)" data-mjx-texclass="ORD"><g data-mml-node="mo"><path data-c="2B" d="M56 237T56 250T70 270H369V420L370 570Q380 583 389 583Q402 583 409 568V270H707Q722 262 722 250T707 230H409V-68Q401 -82 391 -82H389H387Q375 -82 369 -68V230H70Q56 237 56 250Z"></path></g></g></g></g></g></svg></mjx-container></span>ion:</li> </ul> <div><span class="math-block "> <mjx-container class="MathJax" jax="SVG" display="true"><svg style="vertical-align: -0.186ex;" width="15.684ex" height="2.053ex" role="img" focusable="false" viewbox="0 -825.2 6932.3 907.2"><g stroke="currentColor" fill="currentColor" stroke-width="0" transform="scale(1,-1)"><g data-mml-node="math"><g data-mml-node="TeXAtom" data-mjx-texclass="ORD"><g data-mml-node="mi"><path data-c="4C" d="M128 622Q121 629 117 631T101 634T58 637H25V683H36Q48 680 182 680Q324 680 348 683H360V637H333Q273 637 258 635T233 622L232 342V129Q232 57 237 52Q243 47 313 47Q384 47 410 53Q470 70 498 110T536 221Q536 226 537 238T540 261T542 272T562 273H582V268Q580 265 568 137T554 5V0H25V46H58Q100 47 109 49T128 61V622Z"></path><path data-c="69" d="M69 609Q69 637 87 653T131 669Q154 667 171 652T188 609Q188 579 171 564T129 549Q104 549 87 564T69 609ZM247 0Q232 3 143 3Q132 3 106 3T56 1L34 0H26V46H42Q70 46 91 49Q100 53 102 60T104 102V205V293Q104 345 102 359T88 378Q74 385 41 385H30V408Q30 431 32 431L42 432Q52 433 70 434T106 436Q123 437 142 438T171 441T182 442H185V62Q190 52 197 50T232 46H255V0H247Z" transform="translate(625,0)"></path></g></g><g data-mml-node="mo" transform="translate(1180.8,0)"><path data-c="27F6" d="M84 237T84 250T98 270H1444Q1328 357 1301 493Q1301 494 1301 496T1300 499Q1300 511 1317 511H1320Q1329 511 1332 510T1338 506T1341 497T1344 481T1352 456Q1374 389 1425 336T1544 261Q1553 258 1553 250Q1553 244 1548 241T1524 231T1486 212Q1445 186 1415 152T1370 85T1349 35T1341 4Q1339 -6 1336 -8T1320 -11Q1300 -11 1300 0Q1300 7 1305 25Q1337 151 1444 230H98Q84 237 84 250Z"></path></g><g data-mml-node="msup" transform="translate(3096.6,0)"><g data-mml-node="TeXAtom" data-mjx-texclass="ORD"><g data-mml-node="mi"><path data-c="4C" d="M128 622Q121 629 117 631T101 634T58 637H25V683H36Q48 680 182 680Q324 680 348 683H360V637H333Q273 637 258 635T233 622L232 342V129Q232 57 237 52Q243 47 313 47Q384 47 410 53Q470 70 498 110T536 221Q536 226 537 238T540 261T542 272T562 273H582V268Q580 265 568 137T554 5V0H25V46H58Q100 47 109 49T128 61V622Z"></path><path data-c="69" d="M69 609Q69 637 87 653T131 669Q154 667 171 652T188 609Q188 579 171 564T129 549Q104 549 87 564T69 609ZM247 0Q232 3 143 3Q132 3 106 3T56 1L34 0H26V46H42Q70 46 91 49Q100 53 102 60T104 102V205V293Q104 345 102 359T88 378Q74 385 41 385H30V408Q30 431 32 431L42 432Q52 433 70 434T106 436Q123 437 142 438T171 441T182 442H185V62Q190 52 197 50T232 46H255V0H247Z" transform="translate(625,0)"></path></g></g><g data-mml-node="TeXAtom" transform="translate(936,413) scale(0.707)" data-mjx-texclass="ORD"><g data-mml-node="mo"><path data-c="2B" d="M56 237T56 250T70 270H369V420L370 570Q380 583 389 583Q402 583 409 568V270H707Q722 262 722 250T707 230H409V-68Q401 -82 391 -82H389H387Q375 -82 369 -68V230H70Q56 237 56 250Z"></path></g></g></g><g data-mml-node="mo" transform="translate(4854.9,0)"><path data-c="2B" d="M56 237T56 250T70 270H369V420L370 570Q380 583 389 583Q402 583 409 568V270H707Q722 262 722 250T707 230H409V-68Q401 -82 391 -82H389H387Q375 -82 369 -68V230H70Q56 237 56 250Z"></path></g><g data-mml-node="msup" transform="translate(5855.1,0)"><g data-mml-node="TeXAtom" data-mjx-texclass="ORD"><g data-mml-node="mi"><path data-c="65" d="M28 218Q28 273 48 318T98 391T163 433T229 448Q282 448 320 430T378 380T406 316T415 245Q415 238 408 231H126V216Q126 68 226 36Q246 30 270 30Q312 30 342 62Q359 79 369 104L379 128Q382 131 395 131H398Q415 131 415 121Q415 117 412 108Q393 53 349 21T250 -11Q155 -11 92 58T28 218ZM333 275Q322 403 238 411H236Q228 411 220 410T195 402T166 381T143 340T127 274V267H333V275Z"></path></g></g><g data-mml-node="TeXAtom" transform="translate(477,413) scale(0.707)" data-mjx-texclass="ORD"><g data-mml-node="mo"><path data-c="2212" d="M84 237T84 250T98 270H679Q694 262 694 250T679 230H98Q84 237 84 250Z"></path></g></g></g></g></g></svg></mjx-container></span></div> <ul> <li>The charge of an ion is determined by the imbalance of the number of protons and electrons in the atom. Therefore, for lithium ion, the charge is determined as follows:</li> </ul> <div><span class="math-block "> <mjx-container class="MathJax" jax="SVG" display="true"><svg style="vertical-align: -2.036ex;" width="56.5ex" height="5.204ex" role="img" focusable="false" viewbox="0 -1400 24973 2300"><g stroke="currentColor" fill="currentColor" stroke-width="0" transform="scale(1,-1)"><g data-mml-node="math"><g data-mml-node="mtable"><g data-mml-node="mtr" transform="translate(0,650)"><g data-mml-node="mtd"><g data-mml-node="mtext"><path data-c="A0" d=""></path><path data-c="49" d="M328 0Q307 3 180 3T32 0H21V46H43Q92 46 106 49T126 60Q128 63 128 342Q128 620 126 623Q122 628 118 630T96 635T43 637H21V683H32Q53 680 180 680T328 683H339V637H317Q268 637 254 634T234 623Q232 620 232 342Q232 63 234 60Q238 55 242 53T264 48T317 46H339V0H328Z" transform="translate(250,0)"></path><path data-c="6F" d="M28 214Q28 309 93 378T250 448Q340 448 405 380T471 215Q471 120 407 55T250 -10Q153 -10 91 57T28 214ZM250 30Q372 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data-mml-node="mo" transform="translate(9336.8,0)"><path data-c="3D" d="M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z"></path></g><g data-mml-node="mn" transform="translate(10392.6,0)"><path data-c="31" d="M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z"></path></g><g data-mml-node="mo" transform="translate(10892.6,0)"><path data-c="2212" d="M84 237T84 250T98 270H679Q694 262 694 250T679 230H98Q84 237 84 250Z"></path></g></g></g></g></g></g></svg></mjx-container></span></div> <ul> <li>Positive ions are called cations. Cations are formed when a neutral atom loses electrons.</li> <li>Negative ions are called anions. Anions are formed when a neutral atom gains electrons.</li> <li>In nature, cations and anions occur together so that matter remains charge-neutral. For example, in table salt, sodium cations ( <span class="math-inline "> <mjx-container class="MathJax" jax="SVG"><svg style="vertical-align: -0.025ex;" width="4.26ex" height="1.885ex" role="img" focusable="false" viewbox="0 -822.3 1883.1 833.3"><g stroke="currentColor" fill="currentColor" stroke-width="0" transform="scale(1,-1)"><g data-mml-node="math"><g data-mml-node="msup"><g data-mml-node="TeXAtom" data-mjx-texclass="ORD"><g data-mml-node="mi"><path data-c="4E" d="M42 46Q74 48 94 56T118 69T128 86V634H124Q114 637 52 637H25V683H232L235 680Q237 679 322 554T493 303L578 178V598Q572 608 568 613T544 627T492 637H475V683H483Q498 680 600 680Q706 680 715 683H724V637H707Q634 633 622 598L621 302V6L614 0H600Q585 0 582 3T481 150T282 443T171 605V345L172 86Q183 50 257 46H274V0H265Q250 3 150 3Q48 3 33 0H25V46H42Z"></path><path data-c="61" d="M137 305T115 305T78 320T63 359Q63 394 97 421T218 448Q291 448 336 416T396 340Q401 326 401 309T402 194V124Q402 76 407 58T428 40Q443 40 448 56T453 109V145H493V106Q492 66 490 59Q481 29 455 12T400 -6T353 12T329 54V58L327 55Q325 52 322 49T314 40T302 29T287 17T269 6T247 -2T221 -8T190 -11Q130 -11 82 20T34 107Q34 128 41 147T68 188T116 225T194 253T304 268H318V290Q318 324 312 340Q290 411 215 411Q197 411 181 410T156 406T148 403Q170 388 170 359Q170 334 154 320ZM126 106Q126 75 150 51T209 26Q247 26 276 49T315 109Q317 116 318 175Q318 233 317 233Q309 233 296 232T251 223T193 203T147 166T126 106Z" transform="translate(750,0)"></path></g></g><g data-mml-node="TeXAtom" transform="translate(1283,410.1) scale(0.707)" data-mjx-texclass="ORD"><g data-mml-node="mo"><path data-c="2B" d="M56 237T56 250T70 270H369V420L370 570Q380 583 389 583Q402 583 409 568V270H707Q722 262 722 250T707 230H409V-68Q401 -82 391 -82H389H387Q375 -82 369 -68V230H70Q56 237 56 250Z"></path></g></g></g></g></g></svg></mjx-container></span>) occur together with chloride anions ( <span class="math-inline "> <mjx-container class="MathJax" jax="SVG"><svg style="vertical-align: -0.048ex;" width="3.695ex" height="1.958ex" role="img" focusable="false" viewbox="0 -844.3 1633.1 865.3"><g stroke="currentColor" fill="currentColor" stroke-width="0" transform="scale(1,-1)"><g data-mml-node="math"><g data-mml-node="msup"><g data-mml-node="TeXAtom" data-mjx-texclass="ORD"><g data-mml-node="mi"><path data-c="43" d="M56 342Q56 428 89 500T174 615T283 681T391 705Q394 705 400 705T408 704Q499 704 569 636L582 624L612 663Q639 700 643 704Q644 704 647 704T653 705H657Q660 705 666 699V419L660 413H626Q620 419 619 430Q610 512 571 572T476 651Q457 658 426 658Q322 658 252 588Q173 509 173 342Q173 221 211 151Q232 111 263 84T328 45T384 29T428 24Q517 24 571 93T626 244Q626 251 632 257H660L666 251V236Q661 133 590 56T403 -21Q262 -21 159 83T56 342Z"></path><path data-c="6C" d="M42 46H56Q95 46 103 60V68Q103 77 103 91T103 124T104 167T104 217T104 272T104 329Q104 366 104 407T104 482T104 542T103 586T103 603Q100 622 89 628T44 637H26V660Q26 683 28 683L38 684Q48 685 67 686T104 688Q121 689 141 690T171 693T182 694H185V379Q185 62 186 60Q190 52 198 49Q219 46 247 46H263V0H255L232 1Q209 2 183 2T145 3T107 3T57 1L34 0H26V46H42Z" transform="translate(722,0)"></path></g></g><g data-mml-node="TeXAtom" transform="translate(1033,432.1) scale(0.707)" data-mjx-texclass="ORD"><g data-mml-node="mo"><path data-c="2212" d="M84 237T84 250T98 270H679Q694 262 694 250T679 230H98Q84 237 84 250Z"></path></g></g></g></g></g></svg></mjx-container></span>).</li> <li>For most main-group elements, the periodic table can be used to predict the number of electrons lost or gained to form ions.<br /> <figure style="text-align: center"><img src="https://cdn.mathpix.com/cropped/d9dca550-7f0d-4378-98ee-b8025409a8ca-09.jpg?height=599&width=1451&top_left_y=1840&top_left_x=381" alt="" data-align="center" /></figure><br /> © 2015 Pearson Education. Inc.</li> </ul> <h2 type="section" data-unnumbered="true" id="isotopes-%5C%26-atomic-mass" class="section-title"> ISOTOPES & ATOMIC MASS</h2> <ul> <li>Atoms of the same element that posseess different number of neutrons are called isotopes.</li> <li>Isotopes of an element have the same atomic number (Z), but different mass number (A).<br /> <span class="math-inline "> <mjx-container class="MathJax" jax="SVG"><svg style="vertical-align: -0.708ex;" width="4.489ex" height="2.609ex" role="img" focusable="false" viewbox="0 -840.1 1984.1 1153"><g stroke="currentColor" fill="currentColor" stroke-width="0" transform="scale(1,-1)"><g data-mml-node="math"><g data-mml-node="msubsup"><g data-mml-node="TeXAtom" data-mjx-texclass="ORD"></g><g data-mml-node="TeXAtom" transform="translate(33,369.2) scale(0.707)" data-mjx-texclass="ORD"><g data-mml-node="mn"><path data-c="32" d="M109 429Q82 429 66 447T50 491Q50 562 103 614T235 666Q326 666 387 610T449 465Q449 422 429 383T381 315T301 241Q265 210 201 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660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z"></path><path data-c="30" d="M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z" transform="translate(500,0)"></path></g></g></g><g data-mml-node="TeXAtom" data-mjx-texclass="ORD" transform="translate(790.1,0)"><g data-mml-node="mi"><path data-c="4E" d="M42 46Q74 48 94 56T118 69T128 86V634H124Q114 637 52 637H25V683H232L235 680Q237 679 322 554T493 303L578 178V598Q572 608 568 613T544 627T492 637H475V683H483Q498 680 600 680Q706 680 715 683H724V637H707Q634 633 622 598L621 302V6L614 0H600Q585 0 582 3T481 150T282 443T171 605V345L172 86Q183 50 257 46H274V0H265Q250 3 150 3Q48 3 33 0H25V46H42Z"></path><path data-c="65" d="M28 218Q28 273 48 318T98 391T163 433T229 448Q282 448 320 430T378 380T406 316T415 245Q415 238 408 231H126V216Q126 68 226 36Q246 30 270 30Q312 30 342 62Q359 79 369 104L379 128Q382 131 395 131H398Q415 131 415 121Q415 117 412 108Q393 53 349 21T250 -11Q155 -11 92 58T28 218ZM333 275Q322 403 238 411H236Q228 411 220 410T195 402T166 381T143 340T127 274V267H333V275Z" transform="translate(750,0)"></path></g></g></g></g></svg></mjx-container></span><br /> Ne-20<br /> (90.48%)<br /> <span class="math-inline "> <mjx-container class="MathJax" jax="SVG"><svg style="vertical-align: -0.687ex;" width="4.489ex" height="2.573ex" role="img" focusable="false" viewbox="0 -833.9 1984.1 1137.4"><g stroke="currentColor" fill="currentColor" stroke-width="0" transform="scale(1,-1)"><g data-mml-node="math"><g data-mml-node="msubsup"><g data-mml-node="TeXAtom" data-mjx-texclass="ORD"></g><g data-mml-node="TeXAtom" transform="translate(33,363) scale(0.707)" data-mjx-texclass="ORD"><g data-mml-node="mn"><path data-c="32" d="M109 429Q82 429 66 447T50 491Q50 562 103 614T235 666Q326 666 387 610T449 465Q449 422 429 383T381 315T301 241Q265 210 201 149L142 93L218 92Q375 92 385 97Q392 99 409 186V189H449V186Q448 183 436 95T421 3V0H50V19V31Q50 38 56 46T86 81Q115 113 136 137Q145 147 170 174T204 211T233 244T261 278T284 308T305 340T320 369T333 401T340 431T343 464Q343 527 309 573T212 619Q179 619 154 602T119 569T109 550Q109 549 114 549Q132 549 151 535T170 489Q170 464 154 447T109 429Z"></path><path data-c="31" d="M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z" transform="translate(500,0)"></path></g></g><g data-mml-node="TeXAtom" transform="translate(33,-287.9) scale(0.707)" data-mjx-texclass="ORD"><g data-mml-node="mn"><path data-c="31" d="M213 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302V6L614 0H600Q585 0 582 3T481 150T282 443T171 605V345L172 86Q183 50 257 46H274V0H265Q250 3 150 3Q48 3 33 0H25V46H42Z"></path><path data-c="65" d="M28 218Q28 273 48 318T98 391T163 433T229 448Q282 448 320 430T378 380T406 316T415 245Q415 238 408 231H126V216Q126 68 226 36Q246 30 270 30Q312 30 342 62Q359 79 369 104L379 128Q382 131 395 131H398Q415 131 415 121Q415 117 412 108Q393 53 349 21T250 -11Q155 -11 92 58T28 218ZM333 275Q322 403 238 411H236Q228 411 220 410T195 402T166 381T143 340T127 274V267H333V275Z" transform="translate(750,0)"></path></g></g></g></g></svg></mjx-container></span><br /> Ne-21<br /> (0.27%)<br /> <span class="math-inline " data-overflow="visible"> <mjx-container class="MathJax" jax="SVG"><svg style="vertical-align: -0.687ex;" width="1.788ex" height="2.573ex" role="img" focusable="false" viewbox="0 -833.9 790.1 1137.4"><g stroke="currentColor" fill="currentColor" stroke-width="0" transform="scale(1,-1)"><g data-mml-node="math"><g data-mml-node="msubsup"><g data-mml-node="TeXAtom" data-mjx-texclass="ORD"></g><g data-mml-node="TeXAtom" transform="translate(33,363) scale(0.707)" data-mjx-texclass="ORD"><g data-mml-node="mn"><path data-c="32" d="M109 429Q82 429 66 447T50 491Q50 562 103 614T235 666Q326 666 387 610T449 465Q449 422 429 383T381 315T301 241Q265 210 201 149L142 93L218 92Q375 92 385 97Q392 99 409 186V189H449V186Q448 183 436 95T421 3V0H50V19V31Q50 38 56 46T86 81Q115 113 136 137Q145 147 170 174T204 211T233 244T261 278T284 308T305 340T320 369T333 401T340 431T343 464Q343 527 309 573T212 619Q179 619 154 602T119 569T109 550Q109 549 114 549Q132 549 151 535T170 489Q170 464 154 447T109 429Z"></path><path data-c="32" d="M109 429Q82 429 66 447T50 491Q50 562 103 614T235 666Q326 666 387 610T449 465Q449 422 429 383T381 315T301 241Q265 210 201 149L142 93L218 92Q375 92 385 97Q392 99 409 186V189H449V186Q448 183 436 95T421 3V0H50V19V31Q50 38 56 46T86 81Q115 113 136 137Q145 147 170 174T204 211T233 244T261 278T284 308T305 340T320 369T333 401T340 431T343 464Q343 527 309 573T212 619Q179 619 154 602T119 569T109 550Q109 549 114 549Q132 549 151 535T170 489Q170 464 154 447T109 429Z" transform="translate(500,0)"></path></g></g><g data-mml-node="TeXAtom" transform="translate(33,-287.9) scale(0.707)" data-mjx-texclass="ORD"><g data-mml-node="mn"><path data-c="31" d="M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z"></path><path data-c="30" d="M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z" transform="translate(500,0)"></path></g></g></g></g></g></svg></mjx-container></span> Ne<br /> Ne-22<br /> (9.25%)</li> <li>For a given element, the relative amount of each isotope in a naturally occurring sample of that element is always the same.</li> <li>The mass of an atom is measured relative to the mass of a chosen standard (carbon-12 atom), and is expressed in atomic mass units (amu).<br /> <figure style="text-align: center"><img src="https://cdn.mathpix.com/cropped/d9dca550-7f0d-4378-98ee-b8025409a8ca-10.jpg?height=555&width=416&top_left_y=541&top_left_x=1641" alt="" data-align="center" /></figure></li> <li>The average atomic mass of an element-called atomic mass- is the mass of that element's natural occurring isotopes weighted according to their abundance. Therefore the atomic mass of an element is closest to the mass of its most abundant isotope.</li> </ul> <h2 type="section" data-unnumbered="true" id="examples%3A" class="section-title"> Examples:</h2> <ol> <li>Determine the number of protons, neutrons and electrons in <span class="math-inline "> <mjx-container class="MathJax" jax="SVG"><svg style="vertical-align: -0.724ex;" width="4.05ex" height="2.625ex" role="img" focusable="false" viewbox="0 -840.1 1790.1 1160"><g stroke="currentColor" fill="currentColor" stroke-width="0" transform="scale(1,-1)"><g data-mml-node="math"><g data-mml-node="msubsup"><g data-mml-node="TeXAtom" data-mjx-texclass="ORD"></g><g data-mml-node="TeXAtom" transform="translate(33,369.2) scale(0.707)" data-mjx-texclass="ORD"><g data-mml-node="mn"><path data-c="33" d="M127 463Q100 463 85 480T69 524Q69 579 117 622T233 665Q268 665 277 664Q351 652 390 611T430 522Q430 470 396 421T302 350L299 348Q299 347 308 345T337 336T375 315Q457 262 457 175Q457 96 395 37T238 -22Q158 -22 100 21T42 130Q42 158 60 175T105 193Q133 193 151 175T169 130Q169 119 166 110T159 94T148 82T136 74T126 70T118 67L114 66Q165 21 238 21Q293 21 321 74Q338 107 338 175V195Q338 290 274 322Q259 328 213 329L171 330L168 332Q166 335 166 348Q166 366 174 366Q202 366 232 371Q266 376 294 413T322 525V533Q322 590 287 612Q265 626 240 626Q208 626 181 615T143 592T132 580H135Q138 579 143 578T153 573T165 566T175 555T183 540T186 520Q186 498 172 481T127 463Z"></path><path data-c="35" d="M164 157Q164 133 148 117T109 101H102Q148 22 224 22Q294 22 326 82Q345 115 345 210Q345 313 318 349Q292 382 260 382H254Q176 382 136 314Q132 307 129 306T114 304Q97 304 95 310Q93 314 93 485V614Q93 664 98 664Q100 666 102 666Q103 666 123 658T178 642T253 634Q324 634 389 662Q397 666 402 666Q410 666 410 648V635Q328 538 205 538Q174 538 149 544L139 546V374Q158 388 169 396T205 412T256 420Q337 420 393 355T449 201Q449 109 385 44T229 -22Q148 -22 99 32T50 154Q50 178 61 192T84 210T107 214Q132 214 148 197T164 157Z" 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342Q56 428 89 500T174 615T283 681T391 705Q394 705 400 705T408 704Q499 704 569 636L582 624L612 663Q639 700 643 704Q644 704 647 704T653 705H657Q660 705 666 699V419L660 413H626Q620 419 619 430Q610 512 571 572T476 651Q457 658 426 658Q322 658 252 588Q173 509 173 342Q173 221 211 151Q232 111 263 84T328 45T384 29T428 24Q517 24 571 93T626 244Q626 251 632 257H660L666 251V236Q661 133 590 56T403 -21Q262 -21 159 83T56 342Z"></path><path data-c="6C" d="M42 46H56Q95 46 103 60V68Q103 77 103 91T103 124T104 167T104 217T104 272T104 329Q104 366 104 407T104 482T104 542T103 586T103 603Q100 622 89 628T44 637H26V660Q26 683 28 683L38 684Q48 685 67 686T104 688Q121 689 141 690T171 693T182 694H185V379Q185 62 186 60Q190 52 198 49Q219 46 247 46H263V0H255L232 1Q209 2 183 2T145 3T107 3T57 1L34 0H26V46H42Z" transform="translate(722,0)"></path></g></g></g></g></svg></mjx-container></span>.</li> </ol> <div><span class="math-block "> <mjx-container class="MathJax" jax="SVG" display="true"><svg style="vertical-align: 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0H25V46H41Z"></path></g></g><g data-mml-node="TeXAtom" transform="translate(589,413) scale(0.707)" data-mjx-texclass="ORD"><g data-mml-node="mn"><path data-c="30" d="M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z"></path></g></g></g><g data-mml-node="mo" transform="translate(5913.3,0)"><path data-c="3D" d="M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z"></path></g></g></g></g></g></g></svg></mjx-container></span></div> <ol start="2"> <li>Which two of the following are isotopes of each other?</li> </ol> <div><span class="math-block "> <mjx-container class="MathJax" jax="SVG" display="true"><svg 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transform="translate(500,0)"></path><path data-c="33" d="M127 463Q100 463 85 480T69 524Q69 579 117 622T233 665Q268 665 277 664Q351 652 390 611T430 522Q430 470 396 421T302 350L299 348Q299 347 308 345T337 336T375 315Q457 262 457 175Q457 96 395 37T238 -22Q158 -22 100 21T42 130Q42 158 60 175T105 193Q133 193 151 175T169 130Q169 119 166 110T159 94T148 82T136 74T126 70T118 67L114 66Q165 21 238 21Q293 21 321 74Q338 107 338 175V195Q338 290 274 322Q259 328 213 329L171 330L168 332Q166 335 166 348Q166 366 174 366Q202 366 232 371Q266 376 294 413T322 525V533Q322 590 287 612Q265 626 240 626Q208 626 181 615T143 592T132 580H135Q138 579 143 578T153 573T165 566T175 555T183 540T186 520Q186 498 172 481T127 463Z" transform="translate(1000,0)"></path></g></g></g><g data-mml-node="TeXAtom" data-mjx-texclass="ORD" transform="translate(1143.7,0)"><g data-mml-node="mi"><path data-c="5A" d="M69 443Q69 452 74 554T80 683H549Q555 677 555 664Q555 649 554 648Q552 645 366 348T179 50T192 49T263 49H275H302Q333 49 353 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61V578Z"></path><path data-c="38" d="M70 417T70 494T124 618T248 666Q319 666 374 624T429 515Q429 485 418 459T392 417T361 389T335 371T324 363L338 354Q352 344 366 334T382 323Q457 264 457 174Q457 95 399 37T249 -22Q159 -22 101 29T43 155Q43 263 172 335L154 348Q133 361 127 368Q70 417 70 494ZM286 386L292 390Q298 394 301 396T311 403T323 413T334 425T345 438T355 454T364 471T369 491T371 513Q371 556 342 586T275 624Q268 625 242 625Q201 625 165 599T128 534Q128 511 141 492T167 463T217 431Q224 426 228 424L286 386ZM250 21Q308 21 350 55T392 137Q392 154 387 169T375 194T353 216T330 234T301 253T274 270Q260 279 244 289T218 306L210 311Q204 311 181 294T133 239T107 157Q107 98 150 60T250 21Z" transform="translate(500,0)"></path><path data-c="35" d="M164 157Q164 133 148 117T109 101H102Q148 22 224 22Q294 22 326 82Q345 115 345 210Q345 313 318 349Q292 382 260 382H254Q176 382 136 314Q132 307 129 306T114 304Q97 304 95 310Q93 314 93 485V614Q93 664 98 664Q100 666 102 666Q103 666 123 658T178 642T253 634Q324 634 389 662Q397 666 402 666Q410 666 410 648V635Q328 538 205 538Q174 538 149 544L139 546V374Q158 388 169 396T205 412T256 420Q337 420 393 355T449 201Q449 109 385 44T229 -22Q148 -22 99 32T50 154Q50 178 61 192T84 210T107 214Q132 214 148 197T164 157Z" transform="translate(1000,0)"></path></g></g></g><g data-mml-node="TeXAtom" data-mjx-texclass="ORD" transform="translate(1143.7,0)"><g data-mml-node="mi"><path data-c="52" d="M130 622Q123 629 119 631T103 634T60 637H27V683H202H236H300Q376 683 417 677T500 648Q595 600 609 517Q610 512 610 501Q610 468 594 439T556 392T511 361T472 343L456 338Q459 335 467 332Q497 316 516 298T545 254T559 211T568 155T578 94Q588 46 602 31T640 16H645Q660 16 674 32T692 87Q692 98 696 101T712 105T728 103T732 90Q732 59 716 27T672 -16Q656 -22 630 -22Q481 -16 458 90Q456 101 456 163T449 246Q430 304 373 320L363 322L297 323H231V192L232 61Q238 51 249 49T301 46H334V0H323Q302 3 181 3Q59 3 38 0H27V46H60Q102 47 111 49T130 61V622ZM491 499V509Q491 527 490 539T481 570T462 601T424 623T362 636Q360 636 340 636T304 637H283Q238 637 234 628Q231 624 231 492V360H289Q390 360 434 378T489 456Q491 467 491 499Z"></path></g></g></g></g></g></g></g></svg></mjx-container></span></div> <ol start="3"> <li>Based on the information below, which is the most abundant isotope of boron (atomic mass <span class="math-inline "> <mjx-container class="MathJax" jax="SVG"><svg style="vertical-align: -0.186ex;" width="7.669ex" height="1.692ex" role="img" focusable="false" viewbox="0 -666 3389.8 748"><g stroke="currentColor" fill="currentColor" stroke-width="0" transform="scale(1,-1)"><g data-mml-node="math"><g data-mml-node="mo"><path data-c="3D" d="M56 347Q56 360 70 367H707Q722 359 722 347Q722 336 708 328L390 327H72Q56 332 56 347ZM56 153Q56 168 72 173H708Q722 163 722 153Q722 140 707 133H70Q56 140 56 153Z"></path></g><g data-mml-node="mn" transform="translate(1055.8,0)"><path data-c="31" d="M213 578L200 573Q186 568 160 563T102 556H83V602H102Q149 604 189 617T245 641T273 663Q275 666 285 666Q294 666 302 660V361L303 61Q310 54 315 52T339 48T401 46H427V0H416Q395 3 257 3Q121 3 100 0H88V46H114Q136 46 152 46T177 47T193 50T201 52T207 57T213 61V578Z"></path><path data-c="30" d="M96 585Q152 666 249 666Q297 666 345 640T423 548Q460 465 460 320Q460 165 417 83Q397 41 362 16T301 -15T250 -22Q224 -22 198 -16T137 16T82 83Q39 165 39 320Q39 494 96 585ZM321 597Q291 629 250 629Q208 629 178 597Q153 571 145 525T137 333Q137 175 145 125T181 46Q209 16 250 16Q290 16 318 46Q347 76 354 130T362 333Q362 478 354 524T321 597Z" transform="translate(500,0)"></path><path data-c="2E" d="M78 60Q78 84 95 102T138 120Q162 120 180 104T199 61Q199 36 182 18T139 0T96 17T78 60Z" transform="translate(1000,0)"></path><path data-c="38" d="M70 417T70 494T124 618T248 666Q319 666 374 624T429 515Q429 485 418 459T392 417T361 389T335 371T324 363L338 354Q352 344 366 334T382 323Q457 264 457 174Q457 95 399 37T249 -22Q159 -22 101 29T43 155Q43 263 172 335L154 348Q133 361 127 368Q70 417 70 494ZM286 386L292 390Q298 394 301 396T311 403T323 413T334 425T345 438T355 454T364 471T369 491T371 513Q371 556 342 586T275 624Q268 625 242 625Q201 625 165 599T128 534Q128 511 141 492T167 463T217 431Q224 426 228 424L286 386ZM250 21Q308 21 350 55T392 137Q392 154 387 169T375 194T353 216T330 234T301 253T274 270Q260 279 244 289T218 306L210 311Q204 311 181 294T133 239T107 157Q107 98 150 60T250 21Z" transform="translate(1278,0)"></path></g><g data-mml-node="TeXAtom" data-mjx-texclass="ORD" transform="translate(2833.8,0)"><g data-mml-node="mi"><path data-c="75" d="M383 58Q327 -10 256 -10H249Q124 -10 105 89Q104 96 103 226Q102 335 102 348T96 369Q86 385 36 385H25V408Q25 431 27 431L38 432Q48 433 67 434T105 436Q122 437 142 438T172 441T184 442H187V261Q188 77 190 64Q193 49 204 40Q224 26 264 26Q290 26 311 35T343 58T363 90T375 120T379 144Q379 145 379 161T380 201T380 248V315Q380 361 370 372T320 385H302V431Q304 431 378 436T457 442H464V264Q464 84 465 81Q468 61 479 55T524 46H542V0Q540 0 467 -5T390 -11H383V58Z"></path></g></g></g></g></svg></mjx-container></span> )?</li> </ol> <div class="table_tabular" style="text-align: center"> <div class="inline-tabular"><table class="tabular"> <tbody> <tr style="border-top: none !important; border-bottom: none !important;"> <td style="text-align: center; border-left-style: solid !important; border-left-width: 1px !important; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top-style: solid !important; border-top-width: 1px !important; width: auto; vertical-align: middle; ">Isotope</td> <td style="text-align: center; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top-style: solid !important; border-top-width: 1px !important; width: auto; vertical-align: middle; "><span class="math-inline "> <mjx-container class="MathJax" jax="SVG"><svg style="vertical-align: 0;" width="3.878ex" height="1.869ex" role="img" focusable="false" viewbox="0 -826.2 1714.2 826.2"><g stroke="currentColor" fill="currentColor" stroke-width="0" transform="scale(1,-1)"><g data-mml-node="math"><g data-mml-node="msup"><g data-mml-node="TeXAtom" data-mjx-texclass="ORD"></g><g data-mml-node="TeXAtom" transform="translate(33,363) scale(0.707)" data-mjx-texclass="ORD"><g data-mml-node="TeXAtom" data-mjx-texclass="ORD"><g data-mml-node="mn"><path data-c="1D7CF" d="M481 0L294 3Q136 3 109 0H96V62H227V304Q227 546 225 546Q169 529 97 529H80V591H97Q231 591 308 647L319 655H333Q355 655 359 644Q361 640 361 351V62H494V0H481Z"></path></g><g data-mml-node="mn" transform="translate(575,0)"><path data-c="1D7CE" d="M266 654H280H282Q500 654 524 418Q529 370 529 320Q529 125 456 52Q397 -10 287 -10Q110 -10 63 154Q45 212 45 316Q45 504 113 585Q140 618 185 636T266 654ZM374 548Q347 604 286 604Q247 604 218 575Q197 552 193 511T188 311Q188 159 196 116Q202 87 225 64T287 41Q339 41 367 87Q379 107 382 152T386 329Q386 518 374 548Z"></path></g></g></g></g><g data-mml-node="TeXAtom" data-mjx-texclass="ORD" transform="translate(896.2,0)"><g data-mml-node="mi"><path data-c="1D401" d="M720 510Q720 476 704 448T665 404T619 377T580 362L564 359L583 356Q602 353 632 342T690 312Q712 292 725 276Q752 235 752 189V183Q752 160 741 125Q698 18 547 2Q543 1 288 0H39V62H147V624H39V686H264H409Q502 686 542 681T624 655Q720 607 720 510ZM563 513Q563 553 548 578T518 611T486 622Q479 624 385 624H293V382H375Q458 383 467 385Q563 405 563 513ZM590 192Q590 307 505 329Q504 330 503 330L398 331H293V62H391H400H444Q496 62 528 75T580 131Q590 155 590 192Z"></path></g></g></g></g></svg></mjx-container></span></td> <td style="text-align: center; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top-style: solid !important; border-top-width: 1px !important; width: auto; vertical-align: middle; "><span class="math-inline "> <mjx-container class="MathJax" jax="SVG"><svg style="vertical-align: 0;" width="3.878ex" height="1.869ex" role="img" focusable="false" viewbox="0 -826.2 1714.2 826.2"><g stroke="currentColor" fill="currentColor" stroke-width="0" transform="scale(1,-1)"><g data-mml-node="math"><g data-mml-node="msup"><g data-mml-node="TeXAtom" data-mjx-texclass="ORD"></g><g data-mml-node="TeXAtom" transform="translate(33,363) scale(0.707)" data-mjx-texclass="ORD"><g data-mml-node="TeXAtom" data-mjx-texclass="ORD"><g data-mml-node="mn"><path data-c="1D7CF" d="M481 0L294 3Q136 3 109 0H96V62H227V304Q227 546 225 546Q169 529 97 529H80V591H97Q231 591 308 647L319 655H333Q355 655 359 644Q361 640 361 351V62H494V0H481Z"></path></g><g data-mml-node="mn" transform="translate(575,0)"><path data-c="1D7CF" d="M481 0L294 3Q136 3 109 0H96V62H227V304Q227 546 225 546Q169 529 97 529H80V591H97Q231 591 308 647L319 655H333Q355 655 359 644Q361 640 361 351V62H494V0H481Z"></path></g></g></g></g><g data-mml-node="TeXAtom" data-mjx-texclass="ORD" transform="translate(896.2,0)"><g data-mml-node="mi"><path data-c="1D401" d="M720 510Q720 476 704 448T665 404T619 377T580 362L564 359L583 356Q602 353 632 342T690 312Q712 292 725 276Q752 235 752 189V183Q752 160 741 125Q698 18 547 2Q543 1 288 0H39V62H147V624H39V686H264H409Q502 686 542 681T624 655Q720 607 720 510ZM563 513Q563 553 548 578T518 611T486 622Q479 624 385 624H293V382H375Q458 383 467 385Q563 405 563 513ZM590 192Q590 307 505 329Q504 330 503 330L398 331H293V62H391H400H444Q496 62 528 75T580 131Q590 155 590 192Z"></path></g></g></g></g></svg></mjx-container></span></td> </tr> <tr style="border-top: none !important; border-bottom: none !important;"> <td style="text-align: center; border-left-style: solid !important; border-left-width: 1px !important; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">Mass (amu)</td> <td style="text-align: center; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">10.0</td> <td style="text-align: center; border-right-style: solid !important; border-right-width: 1px !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top: none !important; width: auto; vertical-align: middle; ">11.0</td> </tr> </tbody> </table> </div></div> <h2 type="section" data-unnumbered="true" id="calculating-atomic-masses-from-isotopic-data" class="section-title"> CALCULATING ATOMIC MASSES FROM ISOTOPIC DATA</h2> <ul> <li>The atomic mass of an element can be calculated from the mass and abundance of its isotopes as shown below:</li> </ul> <div><span class="math-block "> <mjx-container 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type="section" data-unnumbered="true" id="examples%3A-2" class="section-title"> Examples:</h2> <ol> <li>Calculate the average atomic mass of silver from the following isotopic data:</li> </ol> <div class="table_tabular" style="text-align: center"> <div class="inline-tabular"><table class="tabular"> <tbody> <tr style="border-top: none !important; border-bottom: none !important;"> <td style="text-align: right; border-left: none !important; border-right: none !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top-style: solid !important; border-top-width: 1px !important; width: auto; vertical-align: middle; ">Isotope</td> <td style="text-align: center; border-right: none !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top-style: solid !important; border-top-width: 1px !important; width: auto; vertical-align: middle; ">Mass (amu)</td> <td style="text-align: center; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top-style: solid !important; border-top-width: 1px !important; width: auto; vertical-align: middle; ">Abundance (%)</td> </tr> <tr style="border-top: none !important; border-bottom: none !important;"> <td style="text-align: right; border-left: none !important; border-right: none !important; border-bottom: none !important; border-top: none !important; width: auto; vertical-align: middle; "><span class="math-inline "> <mjx-container class="MathJax" jax="SVG"><svg style="vertical-align: -0.466ex;" width="5.416ex" height="2.369ex" role="img" focusable="false" viewbox="0 -841 2393.7 1047"><g stroke="currentColor" fill="currentColor" stroke-width="0" transform="scale(1,-1)"><g data-mml-node="math"><g data-mml-node="msup"><g data-mml-node="TeXAtom" data-mjx-texclass="ORD"></g><g data-mml-node="TeXAtom" transform="translate(33,363) scale(0.707)" data-mjx-texclass="ORD"><g data-mml-node="mn"><path data-c="31" d="M213 578L200 573Q186 568 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18L103 24Q67 55 67 108Q67 155 96 193Q52 237 52 292Q52 355 102 398T223 442Q274 442 318 416L329 409ZM299 343Q294 371 273 387T221 404Q192 404 171 388T145 343Q142 326 142 292Q142 248 149 227T179 192Q196 182 222 182Q244 182 260 189T283 207T294 227T299 242Q302 258 302 292T299 343ZM403 -75Q403 -50 389 -34T348 -11T299 -2T245 0H218Q151 0 138 -6Q118 -15 107 -34T95 -74Q95 -84 101 -97T122 -127T170 -155T250 -167Q319 -167 361 -139T403 -75Z" transform="translate(750,0)"></path></g></g></g></g></svg></mjx-container></span></td> <td style="text-align: center; border-right: none !important; border-bottom: none !important; border-top: none !important; width: auto; vertical-align: middle; ">106.90509</td> <td style="text-align: center; border-bottom: none !important; border-top: none !important; width: auto; vertical-align: middle; ">51.84</td> </tr> <tr style="border-top: none !important; border-bottom: none !important;"> <td style="text-align: right; border-left: none !important; border-right: none 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343Q142 326 142 292Q142 248 149 227T179 192Q196 182 222 182Q244 182 260 189T283 207T294 227T299 242Q302 258 302 292T299 343ZM403 -75Q403 -50 389 -34T348 -11T299 -2T245 0H218Q151 0 138 -6Q118 -15 107 -34T95 -74Q95 -84 101 -97T122 -127T170 -155T250 -167Q319 -167 361 -139T403 -75Z" transform="translate(750,0)"></path></g></g></g></g></svg></mjx-container></span></td> <td style="text-align: center; border-right: none !important; border-bottom: none !important; border-top: none !important; width: auto; vertical-align: middle; ">108.90476</td> <td style="text-align: center; border-bottom: none !important; border-top: none !important; width: auto; vertical-align: middle; ">48.16</td> </tr> <tr style="border-top: none !important; border-bottom: none !important;"> <td style="text-align: left; border-left: none !important; border-bottom: none !important; border-top: none !important; border-bottom: none !important; " colspan="3"><span class="math-inline "> <mjx-container class="MathJax" 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181 410T156 406T148 403Q170 388 170 359Q170 334 154 320ZM126 106Q126 75 150 51T209 26Q247 26 276 49T315 109Q317 116 318 175Q318 233 317 233Q309 233 296 232T251 223T193 203T147 166T126 106Z"></path><path data-c="6D" d="M41 46H55Q94 46 102 60V68Q102 77 102 91T102 122T103 161T103 203Q103 234 103 269T102 328V351Q99 370 88 376T43 385H25V408Q25 431 27 431L37 432Q47 433 65 434T102 436Q119 437 138 438T167 441T178 442H181V402Q181 364 182 364T187 369T199 384T218 402T247 421T285 437Q305 442 336 442Q351 442 364 440T387 434T406 426T421 417T432 406T441 395T448 384T452 374T455 366L457 361L460 365Q463 369 466 373T475 384T488 397T503 410T523 422T546 432T572 439T603 442Q729 442 740 329Q741 322 741 190V104Q741 66 743 59T754 49Q775 46 803 46H819V0H811L788 1Q764 2 737 2T699 3Q596 3 587 0H579V46H595Q656 46 656 62Q657 64 657 200Q656 335 655 343Q649 371 635 385T611 402T585 404Q540 404 506 370Q479 343 472 315T464 232V168V108Q464 78 465 68T468 55T477 49Q498 46 526 46H542V0H534L510 1Q487 2 460 2T422 3Q319 3 310 0H302V46H318Q379 46 379 62Q380 64 380 200Q379 335 378 343Q372 371 358 385T334 402T308 404Q263 404 229 370Q202 343 195 315T187 232V168V108Q187 78 188 68T191 55T200 49Q221 46 249 46H265V0H257L234 1Q210 2 183 2T145 3Q42 3 33 0H25V46H41Z" transform="translate(500,0)"></path><path data-c="75" d="M383 58Q327 -10 256 -10H249Q124 -10 105 89Q104 96 103 226Q102 335 102 348T96 369Q86 385 36 385H25V408Q25 431 27 431L38 432Q48 433 67 434T105 436Q122 437 142 438T172 441T184 442H187V261Q188 77 190 64Q193 49 204 40Q224 26 264 26Q290 26 311 35T343 58T363 90T375 120T379 144Q379 145 379 161T380 201T380 248V315Q380 361 370 372T320 385H302V431Q304 431 378 436T457 442H464V264Q464 84 465 81Q468 61 479 55T524 46H542V0Q540 0 467 -5T390 -11H383V58Z" transform="translate(1333,0)"></path></g></g></g></g></svg></mjx-container></span></td> </tr> </tbody> </table> </div></div> <ol start="2"> <li>Calculate the average atomic mass of gallium from the following isotopic data:</li> </ol> <div class="table_tabular" style="text-align: center"> <div class="inline-tabular"><table class="tabular"> <tbody> <tr style="border-top: none !important; border-bottom: none !important;"> <td style="text-align: center; border-left: none !important; border-right: none !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top-style: solid !important; border-top-width: 1px !important; width: auto; vertical-align: middle; ">Isotope</td> <td style="text-align: center; border-right: none !important; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top-style: solid !important; border-top-width: 1px !important; width: auto; vertical-align: middle; ">Mass (amu)</td> <td style="text-align: center; border-bottom-style: solid !important; border-bottom-width: 1px !important; border-top-style: solid !important; border-top-width: 1px !important; width: auto; vertical-align: middle; ">Abundance (%)</td> </tr> <tr style="border-top: none !important; border-bottom: none !important;"> <td style="text-align: center; border-left: none !important; border-right: none !important; border-bottom: none !important; border-top: none !important; width: auto; vertical-align: middle; ">Ga-69</td> <td style="text-align: center; border-right: none !important; border-bottom: none !important; border-top: none !important; width: auto; vertical-align: middle; ">68.9256</td> <td style="text-align: center; border-bottom: none !important; border-top: none !important; width: auto; vertical-align: middle; ">60.11</td> </tr> <tr style="border-top: none !important; border-bottom: none !important;"> <td style="text-align: center; border-left: none !important; border-right: none !important; border-bottom: none !important; border-top: none !important; width: auto; vertical-align: middle; ">Ga-71</td> <td style="text-align: center; border-right: none !important; border-bottom: none !important; border-top: none !important; width: auto; vertical-align: middle; ">70.9247</td> <td style="text-align: center; border-bottom: none !important; border-top: none !important; width: auto; vertical-align: middle; ">39.89</td> </tr> </tbody> </table> </div></div> <ol start="3"> <li>A fictitious element is composed of isotopes A and B with masses of 61.9887 and 64.9486 amu, respectfully. The atomic mass of the element is 64.52 amu. What can you conclude about the natural abundances of the two isotopes? Briefly explain your answer.</li> </ol> </div> </div> </main> <footer> <p><small>Converted for LibreTexts accessibility compliance</small></p> </footer>
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