TEA AP® Physics 2: Algebra-Based
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A | Atomic Masses

Resource ID: WopPx8lW@5
Grade Range: PreK - 12

A | Atomic Masses

A | Atomic Masses

Atomic Number, Z Name Atomic Mass Number, A Symbol Atomic Mass (u) Percent Abundance or Decay Mode Half-life, t1/2
0 neutron 1 nn size 12{n} {} 1.008 665 β−β− size 12{β rSup { size 8{ - {}} } } {} 10.37 min
1 Hydrogen 1 1H1H size 12{rSup { size 8{ 1 {}} }H} {} 1.007 825 99.985%
Deuterium 2 2H or D2H or D size 12{rSup { size 8{ 2 {}} }H or D} {} 2.014 102 0.015%
Tritium 3 3H or T3H or T size 12{rSup { size 8{ 3 {}} }H or T} {} 3.016 050 β−β− size 12{β rSup { size 8{ - {}} } } {} 12.33 y
2 Helium 3 3He3He size 12{rSup { size 8{ 3 {}} }He} {} 3.016 030 1.38×10−4%1.38×10−4% size 12{1 "." "38" times "10" rSup { size 8{ - 4} } %} {}
4 4He4He size 12{rSup { size 8{ 4 {}} }He} {} 4.002 603 ≈100%≈100% size 12{ approx "100"%} {}
3 Lithium 6 6Li6Li size 12{rSup { size 8{ 6 {}} }Li} {} 6.015 121 7.5%
7 7Li7Li size 12{rSup { size 8{ 7 {}} }Li} {} 7.016 003 92.5%
4 Beryllium 7 7Be7Be size 12{rSup { size 8{ 7 {}} }Be} {} 7.016 928 EC 53.29 d
9 9Be9Be size 12{rSup { size 8{ 9 {}} }Be} {} 9.012 182 100%
5 Boron 10 10B10B size 12{rSup { size 8{ 10 {}} }B} {} 10.012 937 19.9%
11 11B11B size 12{rSup { size 8{ 11 {}} }B} {} 11.009 305 80.1%
6 Carbon 11 11C11C size 12{rSup { size 8{ 11 {}} }C} {} 11.011 432 EC, β+β+ size 12{β rSup { size 8{+{}} } } {}
12 12C12C size 12{rSup { size 8{ 6 {}} }Li} {} 12.000 000 98.90%
13 13C13C size 12{rSup { size 8{ 13 {}} }C} {} 13.003 355 1.10%
14 14C14C size 12{rSup { size 8{ 14 {}} }C} {} 14.003 241 β−β− size 12{β rSup { size 8{ - {}} } } {} 5730 y
7 Nitrogen 13 13N13N size 12{rSup { size 8{ 13 {}} }N} {} 13.005 738 β+β+ size 12{β rSup { size 8{+{}} } } {} 9.96 min
14 14N14N size 12{rSup { size 8{ 14 {}} }N} {} 14.003 074 99.63%
15 15N15N size 12{rSup { size 8{ 15 {}} }N} {} 15.000 108 0.37%
8 Oxygen 15 15O15O size 12{rSup { size 8{ 15 {}} }O} {} 15.003 065 EC, β+β+ size 12{β rSup { size 8{+{}} } } {} 122 s
16 16O16O size 12{rSup { size 8{ 6 {}} }Li} {} 15.994 915 99.76%
18 18O18O size 12{rSup { size 8{ 18 {}} }O} {} 17.999 160 0.200%
9 Fluorine 18 18F18F size 12{rSup { size 8{ 18 {}} }F} {} 18.000 937 EC, β+β+ size 12{β rSup { size 8{+{}} } } {} 1.83 h
19 19F19F size 12{rSup { size 8{ 6 {}} }Li} {} 18.998 403 100%
10 Neon 20 20Ne20Ne size 12{rSup { size 8{ 20 {}} }Ne} {} 19.992 435 90.51%
22 22Ne22Ne size 12{rSup { size 8{ 22 {}} }Ne} {} 21.991 383 9.22%
11 Sodium 22 22Na22Na size 12{rSup { size 8{ 6 {}} }Li} {} 21.994 434 β+β+ size 12{β rSup { size 8{ - {}} } } {} 2.602 y
23 23Na23Na size 12{rSup { size 8{ 23 {}} }Na} {} 22.989 767 100%
24 24Na24Na size 12{rSup { size 8{ 24 {}} }Na} {} 23.990 961 β−β− size 12{β rSup { size 8{ - {}} } } {} 14.96 h
12 Magnesium 24 24Mg24Mg size 12{rSup { size 8{ 24 {}} }Mg} {} 23.985 042 78.99%
13 Aluminum 27 27Al27Al size 12{rSup { size 8{ 27 {}} }Al} {} 26.981 539 100%
14 Silicon 28 28Si28Si size 12{rSup { size 8{ 28 {}} }Si} {} 27.976 927 92.23% 2.62h
31 31Si31Si size 12{rSup { size 8{ 31 {}} }Si} {} 30.975 362 β−β− size 12{β rSup { size 8{ - {}} } } {}
15 Phosphorus 31 31P31P size 12{rSup { size 8{ 31 {}} }P} {} 30.973 762 100%
32 32P32P size 12{rSup { size 8{ 6 {}} }Li} {} 31.973 907 β−β− size 12{β rSup { size 8{ - {}} } } {} 14.28 d
16 Sulfur 32 32S32S size 12{rSup { size 8{ 6 {}} }Li} {} 31.972 070 95.02%
35 35S35S size 12{rSup { size 8{ 35 {}} }S} {} 34.969 031 β−β− size 12{β rSup { size 8{ - {}} } } {} 87.4 d
17 Chlorine 35 35Cl35Cl size 12{rSup { size 8{ 35 {}} }Cl} {} 34.968 852 75.77%
37 37Cl37Cl size 12{rSup { size 8{ 35 {}} }Cl} {} 36.965 903 24.23%
18 Argon 40 40Ar40Ar size 12{rSup { size 8{ 40 {}} }Ar} {} 39.962 384 99.60%
19 Potassium 39 39K39K size 12{rSup { size 8{ 39 {}} }K} {} 38.963 707 93.26%
40 40K40K size 12{rSup { size 8{ 40 {}} }K} {} 39.963 999 0.0117%, EC, β−β− size 12{β rSup { size 8{ - {}} } } {} 1.28×109y1.28×109y size 12{1 "." "28" times "10" rSup { size 7{9} } y} {}
20 Calcium 40 40Ca40Ca size 12{rSup { size 8{ 40 {}} }Ca} {} 39.962 591 96.94%
21 Scandium 45 45Sc45Sc size 12{rSup { size 8{ 45 {}} }Sc} {} 44.955 910 100%
22 Titanium 48 48Ti48Ti size 12{rSup { size 8{ 48 {}} }Ti} {} 47.947 947 73.8%
23 Vanadium 51 51V51V size 12{rSup { size 8{ 51 {}} }V} {} 50.943 962 99.75%
24 Chromium 52 52Cr52Cr size 12{rSup { size 8{ 52 {}} }Cr} {} 51.940 509 83.79%
25 Manganese 55 55Mn55Mn size 12{rSup { size 8{ 55 {}} }Mn} {} 54.938 047 100%
26 Iron 56 56Fe56Fe size 12{rSup { size 8{ 56 {}} }Fe} {} 55.934 939 91.72%
27 Cobalt 59 59Co59Co size 12{rSup { size 8{ 59 {}} }Co} {} 58.933 198 100%
60 60Co60Co size 12{rSup { size 8{ 60 {}} }Co} {} 59.933 819 β−β− size 12{β rSup { size 8{ - {}} } } {} 5.271 y
28 Nickel 58 58Ni58Ni size 12{rSup { size 8{ 58 {}} }Ni} {} 57.935 346 68.27%
60 60Ni60Ni size 12{rSup { size 8{ 60 {}} }Ni} {} 59.930 788 26.10%
29 Copper 63 63Cu63Cu size 12{rSup { size 8{ 63 {}} }Cu} {} 62.939 598 69.17%
65 65Cu65Cu size 12{rSup { size 8{ 65 {}} }Cu} {} 64.927 793 30.83%
30 Zinc 64 64Zn64Zn size 12{rSup { size 8{ 64 {}} }Zn} {} 63.929 145 48.6%
66 66Zn66Zn size 12{rSup { size 8{ 66 {}} }Zn} {} 65.926 034 27.9%
31 Gallium 69 69Ga69Ga size 12{rSup { size 8{ 69 {}} }Ga} {} 68.925 580 60.1%
32 Germanium 72 72Ge72Ge size 12{rSup { size 8{ 72 {}} }Ge} {} 71.922 079 27.4%
74 74Ge74Ge size 12{rSup { size 8{ 74 {}} }Ge} {} 73.921 177 36.5%
33 Arsenic 75 75As75As size 12{rSup { size 8{ 75 {}} }As} {} 74.921 594 100%
34 Selenium 80 80Se80Se size 12{rSup { size 8{ 80 {}} }Se} {} 79.916 520 49.7%
35 Bromine 79 79Br79Br size 12{rSup { size 8{ 79 {}} }Br} {} 78.918 336 50.69%
36 Krypton 84 84Kr84Kr size 12{rSup { size 8{ 84 {}} }Kr} {} 83.911 507 57.0%
37 Rubidium 85 85Rb85Rb size 12{rSup { size 8{ 85 {}} }Rb} {} 84.911 794 72.17%
38 Strontium 86 86Sr86Sr size 12{rSup { size 8{ 86 {}} }Sr} {} 85.909 267 9.86%
88 88Sr88Sr size 12{rSup { size 8{ 88 {}} }Sr} {} 87.905 619 82.58%
90 90Sr90Sr size 12{rSup { size 8{ 90 {}} }Sr} {} 89.907 738 β−β− size 12{β rSup { size 8{ - {}} } } {} ­ 28.8 y
39 Yttrium 89 89Y89Y size 12{rSup { size 8{ 89 {}} }Y} {} 88.905 849 100%
90 90Y90Y size 12{rSup { size 8{ 90 {}} }Y} {} 89.907 152 β−β− size 12{β rSup { size 8{ - {}} } } {} ­ 64.1 h
40 Zirconium 90 90Zr90Zr size 12{rSup { size 8{ 90 {}} }Zr} {} 89.904 703 51.45%
41 Niobium 93 93Nb93Nb size 12{rSup { size 8{ 93 {}} }Nb} {} 92.906 377 100%
42 Molybdenum 98 98Mo98Mo size 12{rSup { size 8{ 98 {}} }Mo} {} 97.905 406 24.13%
43 Technetium 98 98Tc98Tc size 12{rSup { size 8{ 98 {}} }Tc} {} 97.907 215 β−β− size 12{β rSup { size 8{ - {}} } } {} ­ 4.2×106y4.2×106y size 12{4 "." 2 times "10" rSup { size 8{6} } y} {}
44 Ruthenium 102 102Ru102Ru size 12{rSup { size 8{ 102 {}} }Ru} {} 101.904 348 31.6%
45 Rhodium 103 103Rh103Rh size 12{rSup { size 8{ 103 {}} }Rh} {} 102.905 500 100%
46 Palladium 106 106Pd106Pd size 12{rSup { size 8{ 106 {}} }Pd} {} 105.903 478 27.33%
47 Silver 107 107Ag107Ag size 12{rSup { size 8{ 107 {}} }Ag} {} 106.905 092 51.84%
109 109Ag109Ag size 12{rSup { size 8{ 109 {}} }Ag} {} 108.904 757 48.16%
48 Cadmium 114 114Cd114Cd size 12{rSup { size 8{ 114 {}} }Cd} {} 113.903 357 28.73%
49 Indium 115 115In115In size 12{rSup { size 8{ 115 {}} }In} {} 114.903 880 95.7%, β−β− size 12{β rSup { size 8{ - {}} } } {} ­ 4.4×1014y4.4×1014y size 12{4 "." 4 times "10" rSup { size 8{"14"} } y} {}
50 Tin 120 120Sn120Sn size 12{rSup { size 8{ 120 {}} }Sn} {} 119.902 200 32.59%
51 Antimony 121 121Sb121Sb size 12{rSup { size 8{ 121 {}} }Sb} {} 120.903 821 57.3%
52 Tellurium 130 130Te130Te size 12{rSup { size 8{ 130 {}} }Te} {} 129.906 229 33.8%, β−β− size 12{β rSup { size 8{ - {}} } } {} ­ 2.5×1021y2.5×1021y size 12{2 "." 5 times "10" rSup { size 8{"21"} } y} {}
53 Iodine 127 127I127I size 12{rSup { size 8{ 127 {}} }I} {} 126.904 473 100%
131 131I131I size 12{rSup { size 8{ 131 {}} }I} {} 130.906 114 β−β− size 12{β rSup { size 8{ - {}} } } {} ­ 8.040 d
54 Xenon 132 132Xe132Xe size 12{rSup { size 8{ 132 {}} }Xe} {} 131.904 144 26.9%
136 136Xe136Xe size 12{rSup { size 8{ 136 {}} }Xe} {} 135.907 214 8.9%
55 Cesium 133 133Cs133Cs size 12{rSup { size 8{ 133 {}} }Cs} {} 132.905 429 100%
134 134Cs134Cs size 12{rSup { size 8{ 134 {}} }Cs} {} 133.906 696 EC, β−β− size 12{β rSup { size 8{ - {}} } } {} ­ 2.06 y
56 Barium 137 137Ba137Ba size 12{rSup { size 8{ 137 {}} }Ba} {} 136.905 812 11.23%
138 138Ba138Ba size 12{rSup { size 8{ 138 {}} }Ba} {} 137.905 232 71.70%
57 Lanthanum 139 139La139La size 12{rSup { size 8{ 139 {}} }La} {} 138.906 346 99.91%
58 Cerium 140 140Ce140Ce size 12{rSup { size 8{ 140 {}} }Ce} {} 139.905 433 88.48%
59 Praseodymium 141 141Pr141Pr size 12{rSup { size 8{ 141 {}} }Pr} {} 140.907 647 100%
60 Neodymium 142 142Nd142Nd size 12{rSup { size 8{ 142 {}} }Nd} {} 141.907 719 27.13%
61 Promethium 145 145Pm145Pm size 12{rSup { size 8{ 145 {}} }Pm} {} 144.912 743 EC, αα size 12{α} {} 17.7 y
62 Samarium 152 152Sm152Sm size 12{rSup { size 8{ 152 {}} }Sm} {} 151.919 729 26.7%
63 Europium 153 153Eu153Eu size 12{rSup { size 8{ 153 {}} }Eu} {} 152.921 225 52.2%
64 Gadolinium 158 158Gd158Gd size 12{rSup { size 8{ 158 {}} }Gd} {} 157.924 099 24.84%
65 Terbium 159 159Tb159Tb size 12{rSup { size 8{ 159 {}} }Tb} {} 158.925 342 100%
66 Dysprosium 164 164Dy164Dy size 12{rSup { size 8{ 164 {}} }Dy} {} 163.929 171 28.2%
67 Holmium 165 165Ho165Ho size 12{rSup { size 8{ 165 {}} }Ho} {} 164.930 319 100%
68 Erbium 166 166Er166Er size 12{rSup { size 8{ 166 {}} }Er} {} 165.930 290 33.6%
69 Thulium 169 169Tm169Tm size 12{rSup { size 8{ 169 {}} }Tm} {} 168.934 212 100%
70 Ytterbium 174 174Yb174Yb size 12{rSup { size 8{ 174 {}} }Yb} {} 173.938 859 31.8%
71 Lutecium 175 175Lu175Lu size 12{rSup { size 8{ 174 {}} }Yb} {} 174.940 770 97.41%
72 Hafnium 180 180Hf180Hf size 12{rSup { size 8{ 180 {}} }Hf} {} 179.946 545 35.10%
73 Tantalum 181 181Ta181Ta size 12{rSup { size 8{ 181 {}} }Ta} {} 180.947 992 99.98%
74 Tungsten 184 184W184W size 12{rSup { size 8{ 184 {}} }W} {} 183.950 928 30.67%
75 Rhenium 187 187Re187Re size 12{rSup { size 8{ 187 {}} }Re} {} 186.955 744 62.6%, β−β− size 12{β rSup { size 8{ - {}} } } {} 4.6×1010y4.6×1010y size 12{4 "." 6 times "10" rSup { size 8{"10"} } y} {}
76 Osmium 191 191Os191Os size 12{rSup { size 8{ 191 {}} }Os} {} 190.960 920 β−β− size 12{β rSup { size 8{ - {}} } } {} ­ 15.4 d
192 192Os192Os size 12{rSup { size 8{ 192 {}} }Os} {} 191.961 467 41.0%
77 Iridium 191 191Ir191Ir size 12{rSup { size 8{ 191 {}} }Ir} {} 190.960 584 37.3%
193 193Ir193Ir size 12{rSup { size 8{ 193 {}} }Ir} {} 192.962 917 62.7%
78 Platinum 195 195Pt195Pt size 12{rSup { size 8{ 195 {}} }Pt} {} 194.964 766 33.8%
79 Gold 197 197Au197Au size 12{rSup { size 8{ 197 {}} }Au} {} 196.966 543 100%
198 198Au198Au size 12{rSup { size 8{ 198 {}} }Au} {} 197.968 217 β−β− size 12{β rSup { size 8{ - {}} } } {} ­ 2.696 d
80 Mercury 199 199Hg199Hg size 12{rSup { size 8{ 199 {}} }Hg} {} 198.968 253 16.87%
202 202Hg202Hg size 12{rSup { size 8{ 202 {}} }Hg} {} 201.970 617 29.86%
81 Thallium 205 205Tl205Tl size 12{rSup { size 8{ 205{}} }Tl} {} 204.974 401 70.48%
82 Lead 206 206Pb206Pb size 12{rSup { size 8{ 206{}} }Pb} {} 205.974 440 24.1%
207 207Pb207Pb size 12{rSup { size 8{ 207{}} }Pb} {} 206.975 872 22.1%
208 208Pb208Pb size 12{rSup { size 8{ 208{}} }Pb} {} 207.976 627 52.4%
210 210Pb210Pb size 12{rSup { size 8{ 210{}} }Pb} {} 209.984 163 α,β−α,β− size 12{α,β rSup { size 8{ - {}} } } {} ­ 22.3 y
211 211Pb211Pb size 12{rSup { size 8{ 211{}} }Pb} {} 210.988 735 β−β− size 12{β rSup { size 8{ - {}} } } {} ­ 36.1 min
212 212Pb212Pb size 12{rSup { size 8{ 212{}} }Pb} {} 211.991 871 β−β− size 12{β rSup { size 8{ - {}} } } {} ­ 10.64 h
83 Bismuth 209 209Bi209Bi size 12{rSup { size 8{ 209{}} }Bi} {} 208.980 374 100%
211 211Bi211Bi size 12{rSup { size 8{ 211{}} }Bi} {} 210.987 255 α, β−α, β− size 12{α,β rSup { size 8{ - {}} } } {} 2.14 min
84 Polonium 210 210Po210Po size 12{rSup { size 8{ 210{}} }Po} {} 209.982 848 αα size 12{α} {} 138.38 d
85 Astatine 218 218At218At size 12{rSup { size 8{ 218{}} }At} {} 218.008 684 α, β−α, β− size 12{α,β rSup { size 8{ - {}} } } {} 1.6 s
86 Radon 222 222Rn222Rn size 12{rSup { size 8{ 222{}} }Rn} {} 222.017 570 αα size 12{α} {} 3.82 d
87 Francium 223 223Fr223Fr size 12{rSup { size 8{ 223{}} }Fr} {} 223.019 733 α, β−α, β− size 12{α,β rSup { size 8{ - {}} } } {} 21.8 min
88 Radium 226 226Ra226Ra size 12{rSup { size 8{ 226{}} }Ra} {} 226.025 402 αα size 12{α} {} 1.60×103y1.60×103y size 12{1 "." "60" times "10" rSup { size 8{3} } y} {}
89 Actinium 227 227Ac227Ac size 12{rSup { size 8{ 227{}} }Ac} {} 227.027 750 α,β−α,β− size 12{α,β rSup { size 8{ - {}} } } {} 21.8 y
90 Thorium 228 228Th228Th size 12{rSup { size 8{ 228{}} }Th} {} 228.028 715 αα size 12{α} {} 1.91 y
232 232Th232Th size 12{rSup { size 8{ 232{}} }Th} {} 232.038 054 100%, αα size 12{α} {} 1.41×1010y1.41×1010y size 12{1 "." "41" times "10" rSup { size 8{"10"} } y} {}
91 Protactinium 231 231Pa231Pa size 12{rSup { size 8{ 231{}} }Pa} {} 231.035 880 αα size 12{α} {} 3.28×104y3.28×104y size 12{3 "." "28" times "10" rSup { size 8{4} } y} {}
92 Uranium 233 233U233U size 12{rSup { size 8{ 233{}} }U} {} 233.039 628 αα size 12{α} {} 1.59×103y1.59×103y size 12{1 "." "59" times "10" rSup { size 8{3} } y} {}
235 235U235U size 12{rSup { size 8{ 235{}} }U} {} 235.043 924 0.720%, αα size 12{α} {} 7.04×108y7.04×108y size 12{7 "." "04" times "10" rSup { size 8{8} } y} {}
236 236U236U size 12{rSup { size 8{ 236{}} }U} {} 236.045 562 αα size 12{α} {} 2.34×107y2.34×107y size 12{2 "." "34" times "10" rSup { size 8{7} } y} {}
238 238U238U size 12{rSup { size 8{ 238{}} }U} {} 238.050 784 99.2745%, αα size 12{α} {} 4.47×109y4.47×109y size 12{4 "." "47" times "10" rSup { size 8{9} } y} {}
239 239U239U size 12{rSup { size 8{ 239{}} }U} {} 239.054 289 β−β− size 12{β rSup { size 8{ - {}} } } {} ­ 23.5 min
93 Neptunium 239 239Np239Np size 12{rSup { size 8{ 239{}} }Np} {} 239.052 933 β−β− size 12{β rSup { size 8{ - {}} } } {} ­ 2.355 d
94 Plutonium 239 239Pu239Pu size 12{rSup { size 8{ 239{}} }Pu} {} 239.052 157 αα size 12{α} {} 2.41×104y2.41×104y size 12{2 "." "41" times "10" rSup { size 8{4} } y} {}
95 Americium 243 243Am243Am size 12{rSup { size 8{ 243{}} }Am} {} 243.061 375 α,α, size 12{α,} {} fission 7.37×103y7.37×103y size 12{7 "." "37" times "10" rSup { size 8{3} } y} {}
96 Curium 245 245Cm245Cm size 12{rSup { size 8{ 245{}} }Cm} {} 245.065 483 αα size 12{α} {} 8.50×103y8.50×103y size 12{8 "." "50" times "10" rSup { size 8{3} } y} {}
97 Berkelium 247 247Bk247Bk size 12{rSup { size 8{ 247{}} }Bk} {} 247.070 300 αα size 12{α} {} 1.38×103y1.38×103y size 12{1 "." "38" times "10" rSup { size 8{3} } y} {}
98 Californium 249 249Cf249Cf size 12{rSup { size 8{ 249{}} }Cf} {} 249.074 844 αα size 12{α} {} 351 y
99 Einsteinium 254 254Es254Es size 12{rSup { size 8{ 254{}} }Es} {} 254.088 019 α,β−α,β− size 12{α,β rSup { size 8{ - {}} } } {} ­ 276 d
100 Fermium 253 253Fm253Fm size 12{rSup { size 8{ 253{}} }Fm} {} 253.085 173 EC, αα size 12{α} {} 3.00 d
101 Mendelevium 255 255Md255Md size 12{rSup { size 8{ 255{}} }Md} {} 255.091 081 EC, αα size 12{α} {} 27 min
102 Nobelium 255 255No255No size 12{rSup { size 8{ 255{}} }No} {} 255.093 260 EC, αα size 12{α} {} 3.1 min
103 Lawrencium 257 257Lr257Lr size 12{rSup { size 8{ 257{}} }Lr} {} 257.099 480 EC, αα size 12{α} {} 0.646 s
104 Rutherfordium 261 261Rf261Rf size 12{rSup { size 8{ 261{}} }Rf} {} 261.108 690 αα size 12{α} {} 1.08 min
105 Dubnium 262 262Db262Db size 12{rSup { size 8{ 262{}} }Db} {} 262.113 760 α,α, size 12{α,} {} fission 34 s
106 Seaborgium 263 263Sg263Sg size 12{rSup { size 8{ 263{}} }Sg} {} 263.11 86 α,α, size 12{α,} {} fission 0.8 s
107 Bohrium 262 262Bh262Bh size 12{rSup { size 8{ 262{}} }Bh} {} 262.123 1 αα size 12{α} {} 0.102 s
108 Hassium 264 264Hs264Hs size 12{rSup { size 8{ 264{}} }Hs} {} 264.128 5 αα size 12{α} {} 0.08 ms
109 Meitnerium 266 266Mt266Mt size 12{rSup { size 8{ 266{}} }Mt} {} 266.137 8 αα size 12{α} {} 3.4 ms
Table A1

Atomic Masses

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