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The isotopic mass is defined as the relative atomic mass of a given isotope.
The listed isotopic masses are - similar to the atomic masses - given in daltons (symbol Da) or atomic mass units (u), i.e. as relative masses based on the unbound, neutral carbon isotope 12C in its electronic and nuclear ground state and at rest with the mass Ar(12C) = 12 (exact) [abbreviations: Z = Atomic number, A = mass number].
| Z | Element | A | Isotopic mass | Isotope | |
|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 5 | 6 |
| 1 | H | Hydrogen | 1 | 1.0078250322(6) | 1H |
| 2 | 2.0141017781(8) | 2H | |||
| 3 | 3.01604928199(23) | 3H | |||
| 2 | He | Helium | 3 | 3.01602932(2) | 3He |
| 4 | 4.0026032541(4) | 4He | |||
| 3 | Li | Lithium | 6 | 6.015122887(9) | 6Li |
| 7 | 7.016003 44(3) | 7Li | |||
| 4 | Be | Beryllium | 9 | 9.0121831(5) | 9Be |
| 5 | B | Boron | 10 | 10.012937(3) | 10B |
| 11 | 11.009305(3) | 11B | |||
| 6 | C | Carbon | 12 | 12 (exakt) | 12C |
| 13 | 13.003354835(2) | 13C | |||
| 7 | N | Nitrogen | 14 | 14.003074004(2) | 14N |
| 15 | 15.000108899(4) | 15N | |||
| 8 | O | Oxygen | 16 | 15.994914620(2) | 16O |
| 17 | 16.999131757(5) | 17O | |||
| 18 | 17.999159613(6) | 18O | |||
| 9 | F | Fluorine | 19 | 18.998403163(6) | 19F |
| 10 | Ne | Neon | 20 | 19.99244018(2) | 20Ne |
| 21 | 20.9938467(3) | 21Ne | |||
| 22 | 21.9913851(2) | 22Ne | |||
| 11 | Na | Sodium | 23 | 22.98976928(2) | 23Na |
| 12 | Mg | Magnesium | 24 | 23.98504170(9) | 24Mg |
| 25 | 24.9858370(3) | 25Mg | |||
| 26 | 25.9825930(2) | 26Mg | |||
| 13 | Al | Aluminium (Aluminum) | 27 | 26.9815385(7) | 27Al |
| 14 | Si | Silicon | 28 | 27.976926535(3) | 28Si |
| 29 | 28.976494665(3) | 29Si | |||
| 30 | 29.97377001(2) | 30Si | |||
| 15 | P | Phosphorus | 31 | 30.973761998(5) | 31P |
| 16 | S | Sulfur (Sulphur) | 32 | 31.972071174(9) | 32S |
| 33 | 32.971458910(9) | 33S | |||
| 34 | 33.9678670(3) | 34S | |||
| 36 | 35.967081(2) | 36S | |||
| 17 | Cl | Chlorine | 35 | 34.9688527(3) | 35Cl |
| 37 | 36.9659026(4) | 37Cl | |||
| 18 | Ar | Argon | 36 | 35.9675451(2) | 36Ar |
| 38 | 37.962732(2) | 38Ar | |||
| 40 | 39.96238312(2) | 40Ar | |||
| 19 | K | Potassium | 39 | 38.96370649(3) | 39K |
| 40 | 39.9639982(4) | 40K (radioactive) | |||
| 41 | 40.96182526(3) | 41K | |||
| 20 | Ca | Calcium | 40 | 39.9625909(2) | 40Ca |
| 42 | 41.958618(1) | 42Ca | |||
| 43 | 42.958766(2) | 43Ca | |||
| 44 | 43.955482(2) | 44Ca | |||
| 46 | 45.95369(2) | 46Ca | |||
| 48 | 47.9525228(8) | 48Ca (radioactive) | |||
| 21 | Sc | Scandium | 45 | 44.955908(5) | 45Sc |
| 22 | Ti | Titanium | 46 | 45.952628(3) | 46Ti |
| 47 | 46.951759(3) | 47Ti | |||
| 48 | 47.947942(3) | 48Ti | |||
| 49 | 48.947866(3) | 49Ti | |||
| 50 | 49.944787(3) | 50Ti | |||
| 23 | V | Vanadium | 50 | 49.947156(6) | 50V (radioactive) |
| 51 | 50.943957(6) | 51V | |||
| 24 | Cr | Chromium | 50 | 49.946042(6) | 50Cr |
| 52 | 51.940506(4) | 52Cr | |||
| 53 | 52.940648(4) | 53Cr | |||
| 54 | 53.938879(4) | 54Cr | |||
| 25 | Mn | Manganese | 55 | 54.938044(3) | 55Mn |
| 26 | Fe | Iron | 54 | 53.939609(3) | 54Fe |
| 56 | 55.934936(3) | 56Fe | |||
| 57 | 56.935393(3) | 57Fe | |||
| 58 | 57.933274(3) | 58Fe | |||
| 27 | Co | Cobalt | 59 | 58.933194(4) | 59Co |
| 28 | Ni | Nickel | 58 | 57.935342(3) | 58Ni |
| 60 | 59.930786(3) | 60Ni | |||
| 61 | 60.931056(3) | 61Ni | |||
| 62 | 61.928345(4) | 62Ni | |||
| 64 | 63.927967(4) | 64Ni | |||
| 29 | Cu | Copper | 63 | 62.929598(4) | 63Cu |
| 65 | 64.927790(5) | 65Cu | |||
| 30 | Zn | Zinc | 64 | 63.929142(5) | 64Zn |
| 66 | 65.926034(6) | 66Zn | |||
| 67 | 66.927128(6) | 67Zn | |||
| 68 | 67.924845(6) | 68Zn | |||
| 70 | 69.92532(2) | 70Zn | |||
| 31 | Ga | Gallium | 69 | 68.925574(8) | 69Ga |
| 71 | 70.924703(6) | 71Ga | |||
| 32 | Ge | Germanium | 70 | 69.924249(6) | 70Ge |
| 72 | 71.9220758(5) | 72Ge | |||
| 73 | 72.9234590(4) | 73Ge | |||
| 74 | 73.92117776(9) | 74Ge | |||
| 76 | 75.9214027(2) | 76Ge (radioactive) | |||
| 33 | As | Arsenic | 75 | 74.921595(6) | 75As |
| 34 | Se | Selenium | 74 | 73.9224759(1) | 74Se |
| 76 | 75.9192137(2) | 76Se | |||
| 77 | 76.9199142(5) | 77Se | |||
| 78 | 77.917309(2) | 78Se | |||
| 80 | 79.916522(8) | 80Se | |||
| 82 | 81.916700(9) | 82Se (radioactive) | |||
| 35 | Br | Bromine | 79 | 78.918338(9) | 79Br |
| 81 | 80.91690(9) | 81Br | |||
| 36 | Kr | Krypton | 78 | 77.920365(5) | 78Kr (radioactive) |
| 80 | 79.916378(5) | 80Kr | |||
| 82 | 81.913483(6) | 82Kr | |||
| 83 | 82.914127(2) | 83Kr | |||
| 84 | 83.91149773(3) | 84Kr | |||
| 86 | 85.91061063(3) | 86Kr | |||
| 37 | Rb | Rubidium | 85 | 84.91178974(3) | 85Rb |
| 87 | 86.90918053(5) | 87Rb (radioactive) | |||
| 38 | Sr | Strontium | 84 | 83.913419(8) | 84Sr |
| 86 | 85.909261(8) | 86Sr | |||
| 87 | 86.908878(8) | 87Sr | |||
| 88 | 87.905613(8) | 88Sr | |||
| 39 | Y | Yttrium | 89 | 88.90584(2) | 89Y |
| 40 | Zr | Zirconium | 90 | 89.90470(2) | 90Zr |
| 91 | 90.90564(2) | 91Zr | |||
| 92 | 91.90503(2) | 92Zr | |||
| 94 | 93.90631(2) | 94Zr | |||
| 96 | 95.90827(2) | 96Zr (radioactive) | |||
| 41 | Nb | Niobium | 93 | 92.90637(2) | 93Nb |
| 42 | Mo | Molybdenum | 92 | 91.906808(5) | 92Mo |
| 94 | 93.905085(3) | 94Mo | |||
| 95 | 94.905839(3) | 95Mo | |||
| 96 | 95.904676(3) | 96Mo | |||
| 97 | 96.906018(3) | 97Mo | |||
| 98 | 97.905405(3) | 98Mo | |||
| 100 | 99.907472(7) | 100Mo (radioactive) | |||
| 43 | Tc | Technetium | 98 | 97.90721(3) | 98Tc (radioactive) |
| 44 | Ru | Ruthenium | 96 | 95.907590(3) | 96Ru |
| 98 | 97.90529(5) | 98Ru | |||
| 99 | 98.905934(7) | 99Ru | |||
| 100 | 99.904214(7) | 100Ru | |||
| 101 | 100.905577(8) | 101Ru | |||
| 102 | 101.904344(8) | 102Ru | |||
| 104 | 103.90543(2) | 104Ru | |||
| 45 | Rh | Rhodium | 103 | 102.9 0550(2) | 103Rh |
| 46 | Pd | Palladium | 102 | 101.90560(2) | 102Pd |
| 104 | 103.904031(9) | 104Pd | |||
| 105 | 104.905080(8) | 105Pd | |||
| 106 | 105.903480(8) | 106Pd | |||
| 108 | 107.903892(8) | 108Pd | |||
| 110 | 109.905172(5) | 110Pd | |||
| 47 | Ag | Silver | 107 | 106.90509(2) | 107Ag |
| 109 | 108.904755(9) | 109Ag | |||
| 48 | Cd | Cadmium | 106 | 105.906460(8) | 106Cd |
| 108 | 107.904183(8) | 108Cd | |||
| 110 | 109.903007(4) | 110Cd | |||
| 111 | 110.904183(4) | 111Cd | |||
| 112 | 111.902763(4) | 112Cd | |||
| 113 | 112.904408(3) | 113Cd (radioactive) | |||
| 114 | 113.903365(3) | 114Cd | |||
| 116 | 115.904763(2) | 116Cd (radioactive) | |||
| 49 | In | Indium | 113 | 112.904062(6) | 113In |
| 115 | 114.90387878(8) | 115In (radioactive) | |||
| 50 | Sn | Tin | 112 | 111.904824(4) | 112Sn |
| 114 | 113.902783(6) | 114Sn | |||
| 115 | 114.9033447(1) | 115Sn | |||
| 116 | 115.901743(1) | 116Sn | |||
| 117 | 116.902954(3) | 117Sn | |||
| 118 | 117.901607(3) | 118Sn | |||
| 119 | 118.903311(5) | 119Sn | |||
| 120 | 119.902202(6) | 120Sn | |||
| 122 | 121.90344(2) | 122Sn | |||
| 124 | 123.905277(7) | 124Sn | |||
| 51 | Sb | Antimony | 121 | 120.90381(2) | 121Sb |
| 123 | 122.90421(2) | 123Sb | |||
| 52 | Te | Tellurium | 120 | 119.90406(2) | 120Te |
| 122 | 121.90304(1) | 122Te | |||
| 123 | 122.90427(1) | 123Te | |||
| 124 | 123.90282(1) | 124Te | |||
| 125 | 124.90443(1) | 125Te | |||
| 126 | 125.90331(1) | 126Te | |||
| 128 | 127.904461(6) | 128Te (radioactive) | |||
| 130 | 129.90622275(8) | 130Te (radioactive) | |||
| 53 | I | Iodine | 127 | 126.90447(3) | 127I |
| 54 | Xe | Xenon | 124 | 123.90589(2) | 124Xe |
| 126 | 125.90430(3) | 126Xe | |||
| 128 | 127.903531(7) | 128Xe | |||
| 129 | 128.90478086(4) | 129Xe | |||
| 130 | 129.9035094(1) | 130Xe | |||
| 131 | 130.905084(2) | 131Xe | |||
| 132 | 131.90415509(4) | 132Xe | |||
| 134 | 133.905395(6) | 134Xe | |||
| 136 | 135.90721448(7) | 136Xe (radioactive) | |||
| 55 | Cs | Caesium Cesium | 133 | 132.90545196(6) | 133Cs |
| 56 | Ba | Barium | 130 | 129.90632(2) | 130Ba (radioactive) |
| 132 | 131.905061(7) | 132Ba | |||
| 134 | 133.904508(2) | 134Ba | |||
| 135 | 134.905688(2) | 135Ba | |||
| 136 | 135.904576(2) | 136Ba | |||
| 137 | 136.905827(2) | 137Ba | |||
| 138 | 137.905247(2) | 138Ba | |||
| 57 | La | Lanthanum | 138 | 137.90712(3) | 138La (radioactive) |
| 139 | 138.90636(2) | 139La | |||
| 58 | Ce | Cerium | 136 | 135.907129(3) | 136Ce |
| 138 | 137.90599(7) | 138Ce | |||
| 140 | 139.90544(2) | 140Ce | |||
| 142 | 141.90925(2) | 142Ce | |||
| 59 | Pr | Praseodymium | 141 | 140.90766(2) | 141Pr |
| 60 | Nd | Neodymium | 142 | 141.90773(2) | 142Nd |
| 143 | 142.90982(2) | 143Nd | |||
| 144 | 143.91009(2) | 144Nd (radioactive) | |||
| 145 | 144.91258(2) | 145Nd | |||
| 146 | 145.91312(2) | 146Nd | |||
| 148 | 147.91690(2) | 148Nd | |||
| 150 | 149.92090(2) | 150Nd (radioactive) | |||
| 61 | Pm | Promethium | 145 | 144.91276(2) | 145Pm (radioactive) |
| 62 | Sm | Samarium | 144 | 143.91201(2) | 144Sm |
| 147 | 146.91490(2) | 147Sm (radioactive) | |||
| 148 | 147.91483(2) | 148Sm (radioactive) | |||
| 149 | 148.91719(2) | 149Sm | |||
| 150 | 149.91728(2) | 150Sm | |||
| 152 | 151.91974(2) | 152Sm | |||
| 154 | 153.92222(2) | 154Sm | |||
| 63 | Eu | Europium | 151 | 150.91986(2) | 151Eu (radioactive) |
| 153 | 152.92124(2) | 153Eu | |||
| 64 | Gd | Gadolinium | 152 | 151.91980(2) | 152Gd |
| 154 | 153.92087(2) | 154Gd | |||
| 155 | 154.92263(2) | 155Gd | |||
| 156 | 155.92213(2) | 156Gd | |||
| 157 | 156.92397(2) | 157Gd | |||
| 158 | 157.92411(2) | 158Gd | |||
| 160 | 159.92706(2) | 160Gd | |||
| 65 | Tb | Terbium | 159 | 158.92535(2) | 159Tb |
| 66 | Dy | Dysprosium | 156 | 155.92428(2) | 156Dy |
| 158 | 157.92442(2) | 158Dy | |||
| 160 | 159.92520(2) | 160Dy | |||
| 161 | 160.92694(2) | 161Dy | |||
| 162 | 161.92681(2) | 162Dy | |||
| 163 | 162.92874(2) | 163Dy | |||
| 164 | 163.92918(2) | 164Dy | |||
| 67 | Ho | Holmium | 165 | 164.93033(2) | 165Ho |
| 68 | Er | Erbium | 162 | 161.92879(2) | 162Er |
| 164 | 163.92921(2) | 164Er | |||
| 166 | 165.93030(2) | 166Er | |||
| 167 | 166.93205(2) | 167Er | |||
| 168 | 167.93238(2) | 168Er | |||
| 170 | 169.93547(2) | 170Er | |||
| 69 | Tm | Thulium | 169 | 168.93422(2) | 169Tm |
| 70 | Yb | Ytterbium | 168 | 167.93389(2) | 168Yb |
| 170 | 169.93477(2) | 170Yb | |||
| 171 | 170.93633(2) | 171Yb | |||
| 172 | 171.93639(2) | 172Yb | |||
| 173 | 172.93822(2) | 173Yb | |||
| 174 | 173.93887(2) | 174Yb | |||
| 176 | 175.94258(2) | 176Yb | |||
| 71 | Lu | Lutetium | 175 | 174.94078(2) | 175Lu |
| 176 | 175.94269(2) | 176Lu (radioactive) | |||
| 72 | Hf | Hafnium | 174 | 173.94005(2) | 174Hf (radioactive) |
| 176 | 175.94141(2) | 176Hf | |||
| 177 | 176.94323(2) | 177Hf | |||
| 178 | 177.94371(2) | 178Hf | |||
| 179 | 178.94582(2) | 179Hf | |||
| 180 | 179.94656(2) | 180Hf | |||
| 73 | Ta | Tantalum | 180 | 179.94746(2) | 180Ta (radioactive) |
| 181 | 180.94800(2) | 181Ta | |||
| 74 | W | Tungsten | 180 | 179.94671(2) | 180W (radioactive) |
| 182 | 181.948204(6) | 182 W | |||
| 183 | 182.950223(6) | 183W | |||
| 184 | 183.950931(6) | 184W | |||
| 186 | 185.95436(2) | 186W | |||
| 75 | Re | Rhenium | 185 | 184.952955(8) | 185Re |
| 187 | 186.95575(1) | 187Re (radioactive) | |||
| 76 | Os | Osmium | 184 | 183.952489(9) | 184Os (radioactive) |
| 186 | 185.95384(1) | 186Os (radioactive) | |||
| 187 | 186.95575(1) | 187Os | |||
| 188 | 187.95584(1) | 188Os | |||
| 189 | 188.95814(2) | 189Os | |||
| 190 | 189.95844(2) | 190Os | |||
| 192 | 191.96148(2) | 192Os | |||
| 77 | Ir | Iridium | 191 | 190.96059(2) | 191Ir |
| 193 | 192.96292(2) | 193Ir | |||
| 78 | Pt | Platinum | 190 | 189.95993(4) | 190Pt (radioactive) |
| 192 | 191.96104(2) | 192Pt | |||
| 194 | 193.962681(6) | 194Pt | |||
| 195 | 194.964792(6) | 195Pt | |||
| 196 | 195.964952(6) | 196Pt | |||
| 198 | 197.96789(2) | 198Pt | |||
| 79 | Au | Gold | 197 | 196.966569(5) | 197Au |
| 80 | Hg | Mercury | 196 | 195.96583(2) | 196Hg |
| 198 | 197.966769(3) | 198Hg | |||
| 199 | 198.968281(3) | 199Hg | |||
| 200 | 199.968327(3) | 200Hg | |||
| 201 | 200.970303(5) | 201Hg | |||
| 202 | 201.970643(5) | 202Hg | |||
| 204 | 203.973494(3) | 204Hg | |||
| 81 | Tl | Thallium | 203 | 202.972345(9) | 203Tl |
| 205 | 204.974428(9) | 205Tl | |||
| 82 | Pb | Lead | 204 | 203.973044(8) | 204Pb |
| 206 | 205.974466(8) | 206Pb | |||
| 207 | 206.975897(8) | 207Pb | |||
| 208 | 207.976653(8) | 208Pb | |||
| 83 | Bi | Bismuth | 209 | 208.98040(1) | 209Bi (radioactive) |
| 90 | Th | Thorium | 230 | 230.03313(2) | 230Th (radioactive) |
| 232 | 232.03806(2) | 232Th (radioactive) | |||
| 91 | Pa | Protactinium | 231 | 231.03588(2) | 231Pa (radioactive) |
| 92 | U | Uranium | 233 | 233.03964(2) | 233U (radioactive) |
| 234 | 234.04095(2) | 234U (radioactive) | |||
| 235 | 235.04393(2) | 235U (radioactive) | |||
| 238 | 238.05079(2) | 238U (radioactive) |
[1] - M. Wang, G. Audi, A. H. Wapstra, F. G. Kondev, M. MacCormick, X. Xu, B. Pfeiffer:
The Ame2012 atomic mass evaluation.
Chinese Physics C, (2012), DOI 10.1088/1674-1137/36/12/003.
Last update: 2023-12-01
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