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| Name | Atomic Symbol |
Atomic Number |
Atomic Weight | Footnotes |
| Actinium* | Ac | 89 | ||
| Aluminum | Al | 13 | 26.981538(2) | |
| Americium* | Am | 95 | ||
| Antimony (Stibium) | Sb | 51 | 121.760(1) | g |
| Argon | Ar | 18 | 39.948(1) | g, r |
| Arsenic | As | 33 | 74.92160(2) | |
| Astatine* | At | 85 | ||
| Barium | Ba | 56 | 137.327(7) | |
| Berkelium* | Bk | 97 | ||
| Beryllium | Be | 4 | 9.012182(3) | |
| Bismuth | Bi | 83 | 208.98038(2) | |
| Bohrium* | Bh | 107 | ||
| Boron | B | 5 | 10.811(7) | g, m, r |
| Bromine | Br | 35 | 79.904(1) | |
| Cadmium | Cd | 48 | 112.411(8) | g |
| Caesium (Cesium) | Cs | 55 | 132.90545(2) | |
| Calcium | Ca | 20 | 40.078(4) | g |
| Californium* | Cf | 98 | ||
| Carbon | C | 6 | 12.0107(8) | g, r |
| Cerium | Ce | 58 | 140.116(1) | g |
| Chlorine | Cl | 17 | 35.4527(9) | m |
| Chromium | Cr | 24 | 51.9961(6) | |
| Cobalt | Co | 27 | 58.933200(9) | |
| Copper | Cu | 29 | 63.546(3) | r |
| Curium* | Cm | 96 | ||
| Dubnium* | Db | 105 | ||
| Dysprosium | Dy | 66 | 162.50(3) | g |
| Einsteinium* | Es | 99 | ||
| Erbium | Er | 68 | 167.26(3) | g |
| Europium | Eu | 63 | 151.964(1) | g |
| Fermium* | Fm | 100 | ||
| Fluorine | F | 9 | 18.9984032(5) | |
| Francium* | Fr | 87 | ||
| Gadolinium | Gd | 64 | 157.25(3) | g |
| Gallium | Ga | 31 | 69.723(1) | |
| Germanium | Ge | 32 | 72.61(2) | |
| Gold | Au | 79 | 196.96655(2) | |
| Hafnium | Hf | 72 | 178.49(2) | |
| Hassium* | Hs | 108 | ||
| Helium | He | 2 | 4.002602(2) | g, r |
| Holmium | Ho | 67 | 164.93032(2) | |
| Hydrogen | H | 1 | 1.00794(7) | g, m, r |
| Indium | In | 49 | 114.818(3) | |
| Iodine | I | 53 | 126.90447(3) | |
| Iridium | Ir | 77 | 192.217(3) | |
| Iron | Fe | 26 | 55.845(2) | |
| Krypton | Kr | 36 | 83.80(1) | g, m |
| Lanthanum | La | 57 | 138.9055(2) | g |
| Lawrencium* | Lr | 103 | ||
| Lead | Pb | 82 | 207.2(1) | g, r |
| Lithium | Li | 3 | 6.941(2)† | g, m, r |
| Lutetium | Lu | 71 | 174.967(1) | g |
| Magnesium | Mg | 12 | 24.3050(6) | |
| Manganese | Mn | 25 | 54.938049(9) | |
| Meitnerium* | Mt | 109 | ||
| Mendelevium* | Md | 101 | ||
| Mercury | Hg | 80 | 200.59(2) | |
| Molybdenum | Mo | 42 | 95.94(1) | g |
| Neodymium | Nd | 60 | 144.24(3) | g |
| Neon | Ne | 10 | 20.1797(6) | g, m |
| Neptunium* | Np | 93 | ||
| Nickel | Ni | 28 | 58.6934(2) | |
| Niobium* | Nb | 41 | 92.90638(2) | |
| Nitrogen | N | 7 | 14.00674(7) | g, r |
| Nobelium | No | 102 | ||
| Osmium | Os | 76 | 190.23(3) | g |
| Oxygen | O | 8 | 15.9994(3) | g, r |
| Palladium | Pd | 46 | 106.42(1) | g |
| Phosphorus | P | 15 | 30.973762(4) | |
| Platinum | Pt | 78 | 195.078(2) | |
| Plutonium* | Pu | 94 | ||
| Polonium* | Po | 84 | ||
| Potassium (Kalium) | K | 19 | 39.0983(1) | |
| Praseodymium | Pr | 59 | 140.90765(2) | |
| Promethium* | Pm | 61 | ||
| Protactinium* | Pa | 91 | 231.03588(2) | |
| Radium* | Ra | 88 | ||
| Radon* | Rn | 86 | ||
| Rhenium | Re | 75 | 186.207(1) | |
| Rhodium | Rh | 45 | 102.90550(2) | |
| Rubidium | Rb | 37 | 85.4678(3) | g |
| Ruthenium | Ru | 44 | 101.07(2) | g |
| Rutherfordium* | Rf | 104 | ||
| Samarium | Sm | 62 | 150.36(3) | g |
| Scandium | Sc | 21 | 44.955910(8) | |
| Seaborgium* | Sg | 106 | ||
| Selenium | Se | 34 | 78.96(3) | |
| Silicon | Si | 14 | 28.0855(3) | r |
| Silver | Ag | 47 | 107.8682(2) | g |
| Sodium (Natrium) | Na | 11 | 22.989770(2) | |
| Strontium | Sr | 38 | 87.62(1) | g, r |
| Sulfur | S | 16 | 32.066(6) | g, r |
| Tantalum | Ta | 73 | 180.9479(1) | |
| Technetium* | Tc | 43 | ||
| Tellurium | Te | 52 | 127.60(3) | g |
| Terbium | Tb | 65 | 158.92534(2) | |
| Thallium | Tl | 81 | 204.3833(2) | |
| Thorium* | Th | 90 | 232.0381(1) | g |
| Thulium | Tm | 69 | 168.93421(2) | |
| Tin | Sn | 50 | 118.710(7) | g |
| Titanium | Ti | 22 | 47.867(1) | |
| Tungsten (Wolfram) | W | 74 | 183.84(1) | |
| Ununnilium* | Uun | 110 | ||
| Unununium* | Uuu | 111 | ||
| Ununbium* | Uub | 112 | ||
| Uranium* | U | 92 | 238.0289(1) | g, m |
| Vanadium | V | 23 | 50.9415(1) | |
| Xenon | Xe | 54 | 131.29(2) | g, m |
| Ytterbium | Yb | 70 | 173.04(3) | g |
| Yttrium | Y | 39 | 88.90585(2) | |
| Zinc | Zn | 30 | 65.39(2) | |
| Zirconium | Zr | 40 | 91.224(2) | g |
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*
Element has no stable nuclides. One or more well-known isotopes are given in the accompanying table with the appropriate relative atomic mass and half-life. However, three such elements (Th, Pa, and U) do have a characteristic terrestrial isotopic composition, and for these an atomic weight is tabulated.
†
Commercially available Li materials have atomic weights that are known to range between 6.939 and 6.996; if a more accurate value is required, it must be determined for the specific material.
g
geological specimens are known in which the element has an isotopic composition outside the limits for normal material. The difference between the atomic weight of the element in such specimens and that given in the Table may exceed the stated uncertainty.
m
modified isotopic compositions may be found in commercially available material because it has been subjected to an undisclosed or inadvertent isotopic fractionation. Substantial deviations in atomic weight of the element from that given in the Table can occur.
r
range in isotopic composition of normal terrestrial material prevents a more precise Ar(E) being given; the tabulated Ar(E) value should be applicable to any normal material.
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