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APPENDIX A ATOMIC MASSESAATOMIC MASSES1237

1238APPENDIX A ATOMIC MASSESTable A1 Atomic MassesAtomicNumber, ZNameAtomic MassNumber, ASymbolAtomic Mass(u)Percent Abundance or DecayModeHalf-life,t1/20neutron1n1.008 665β 10.37 min1Hydrogen1H1.007 82599.985%Deuterium22H or D2.014 1020.015%Tritium333.016 050β Helium333.016 0301.38 10 4%444.002 603 100%666.015 1217.5%77Li7.016 00392.5%77Be7.016 928EC999.012 182100%101010.012 93719.9%111111.009 30580.1%111111.011 432EC,121212.000 00098.90%131313.003 3551.10%1414C14.003 241β 5730 y1313N13.005 738β 9.96 min141414.003 07499.63%151515.000 1080.37%151515.003 065EC,161615.994 91599.76%181817.999 1600.200%181818.000 937EC,1919F18.998 trogenOxygenFluorineNeonSodium1H or THeHeLiBeBBCCCNNOOOFβ β 2019.992 43590.51%222221.991 3839.22%222221.994 434β 232322.989 767100%2424Na23.990 961β Mg23.985 04278.99%26.981 539100%27.976 n2828This content is available for free at http://cnx.org/content/col11406/1.7AlSi53.29 dβ 20Ne12.33 y122 s1.83 h2.602 y14.96 h2.62h

APPENDIX A ATOMIC MASSESAtomicNumber, Z151617NamePhosphorusSulfurChlorineAtomic MassNumber, ASymbolAtomic Mass(u)Percent Abundance or DecayMode30.975 362β 3131313130.973 762100%323231.973 907β 323231.972 07095.02%3535S34.969 031β 3535Cl34.968 85275.77%3737Cl36.965 90324.23%Ar39.962 38499.60%SiPPS18Argon404019Potassium393938.963 70793.26%4040K39.963 9990.0117%, EC,Ca39.962 59196.94%44.955 910100%47.947 23Vanadium5151V50.943 96299.75%24Chromium5252Cr51.940 50983.79%25Manganese5555Mn54.938 047100%26Iron5656Fe55.934 93991.72%27Cobalt5959Co58.933 198100%606059.933 819β 585857.935 34668.27%6060Ni59.930 78826.10%6363Cu62.939 59869.17%656564.927 79330.83%646463.929 14548.6%6666Zn65.926 ium696968.925 58060.1%32Germanium727271.922 07927.4%747473.921 17736.5%74.921 594100%GeGe33Arsenic757534Selenium8080Se79.916 52049.7%35Bromine7979Br78.918 33650.69%36Krypton8484Kr83.911 50757.0%37Rubidium8585Rb84.911 79472.17%AsHalf-life,t1/214.28 d87.4 dβ 1.28 10 9 y5.271 y1239

1240APPENDIX A ATOMIC MASSESAtomicNumber, ZNameAtomic MassNumber, A38Strontium8639YttriumAtomic Mass(u)Percent Abundance or DecayMode8685.909 2679.86%888887.905 61982.58%909089.907 738β 898988.905 849100%9090Y89.907 152β SymbolSrSrSrY28.8 y64.1 h40Zirconium9090Zr89.904 70351.45%41Niobium9393Nb92.906 377100%42Molybdenum9898Mo97.905 40624.13%43Technetium989897.907 215β 44Ruthenium102102101.904 34831.6%45Rhodium103103102.905 500100%46Palladium106106Pd105.903 47827.33%47Silver107107Ag106.905 09251.84%109109108.904 75748.16%113.903 35728.73%TcRuRhAg4.2 10 6y48Cadmium11411449Indium115115In114.903 88050Tin120120Sn119.902 20032.59%51Antimony121121120.903 82157.3%52Tellurium13013053Iodine127127126.904 473100%131131I130.906 114β Xe545556XenonCesiumBariumCdSbTeI129.906 229β 95.7%,β 33.8%,132132131.904 14426.9%136136135.907 2148.9%133133132.905 429100%134134Cs133.906 696EC,137137Ba136.905 81211.23%138138137.905 23271.70%XeCsBaβ 57Lanthanum139139La138.906 34699.91%58Cerium140140Ce139.905 43388.48%59Praseodymium141141Pr140.907 647100%60Neodymium142142Nd141.907 71927.13%61Promethium145145Pm144.912 743EC,62Samarium152152151.919 72926.7%This content is available for free at 2α4.4 10 14y2.5 10 21y8.040 d2.06 y17.7 y

APPENDIX A ATOMIC MASSESAtomicNumber, ZNameAtomic MassNumber, A63Europium15364Gadolinium65Atomic Mass(u)Percent Abundance or DecayMode153Eu152.921 22552.2%158158Gd157.924 09924.84%Terbium159159Tb158.925 342100%66Dysprosium164164Dy163.929 17128.2%67Holmium165165164.930 319100%68Erbium166166Er165.930 29033.6%69Thulium169169Tm168.934 212100%70Ytterbium174174173.938 85931.8%71Lutecium175175174.940 77097.41%72Hafnium180180179.946 54535.10%73Tantalum181181180.947 99299.98%74Tungsten184184W183.950 92830.67%75Rhenium187187Re186.955 74462.6%,76Osmium191191190.960 920β 192192191.961 46741.0%191191190.960 58437.3%193193Ir192.962 91762.7%77IridiumSymbolHoYbLuHfTaOsOsIrβ 78Platinum195195Pt194.964 76633.8%79Gold197197Au196.966 543100%198198197.968 217β 199199198.968 25316.87%202202201.970 61729.86%80MercuryAuHgHgHalf-life,t1/24.6 10 10y15.4 d2.696 d81Thallium205205Tl204.974 40170.48%82Lead206206Pb205.974 44024.1%207207206.975 87222.1%208208207.976 62752.4%210210209.984 163α, β 22.3 y211211210.988 735β 36.1 min212212211.991 871β 10.64 h209209208.980 374100%211211Bi210.987 255α, β 2.14 minPo209.982 848α138.38 d218.008 684α, β 1.6 8218At1241

1242APPENDIX A ATOMIC MASSESAtomic Mass(u)Percent Abundance or DecayModeHalf-life,t1/2222.017 570α3.82 d223Fr223.019 733α, β 21.8 min226226Ra226.025 402α1.60 10 3yActinium227227Ac227.027 750α, β 21.8 yThorium228228228.028 715α1.91 y232232232.038 054AtomicNumber, ZNameAtomic MassNumber, h100%,1.41 10 10yα231.035 880α3.28 10 4y233233.039 628α1.59 10 3y235235235.043 924236236236.045 562238238238.050 784239239U239.054 289β 23.5 minNp239.052 933β 2.355 04 10 8y2.34 10 7yα99.2745%,α4.47 10 9y93Neptunium23923994Plutonium239239Pu239.052 157α2.41 10 4y95Americium243243Am243.061 375α, fission7.37 10 3y96Curium245245245.065 483α8.50 10 3y97Berkelium247247247.070 300α1.38 10 3y98Californium249249249.074 844α351 y99Einsteinium254254Es254.088 019α, β 276 d100Fermium253253Fm253.085 173EC,α3.00 d101Mendelevium255255Md255.091 081EC,α27 min102Nobelium255255255.093 260EC,α3.1 min103Lawrencium257257Lr257.099 480EC,α0.646 s104Rutherfordium261261Rf261.108 690α1.08 min105Dubnium262262Db262.113 760α, fission34 s106Seaborgium263263Sg263.11 86α, fission0.8 s107Bohrium262262Bh262.123 1α0.102 s108Hassium264264Hs264.128 5α0.08 ms109Meitnerium266266Mt266.137 8α3.4 msThis content is available for free at http://cnx.org/content/col11406/1.7CmBkCfNo