Atomvægtstabel
| Grundstof | Atomtegn | Atom nr. | Atomvægt |
| Actinium | Ac | 89 | (227) |
| Aluminium | Al | 13 | 26,98154 |
| Americium | Am | 95 | (243) |
| Antimon | Sb | 51 | 121,75 |
| Argon | Ar | 18 | 39,948 |
| Arsen | As | 33 | 74,9216 |
| Astat | At | 85 | (210) |
| Barium | Ba | 56 | 137,34 |
| Berkelium | Bk | 97 | (247) |
| Beryllium | Be | 4 | 9,01213 |
| Bismuth | Bi | 83 | 208,9804 |
| Bly | Pb | 82 | 207,2 |
| Bor | B | 5 | 10,81 |
| Brom | Br | 35 | 79,904 |
| Cadmium | Cd | 48 | 112,40 |
| Calcium | Ca | 20 | 40,08 |
| Californium | Cf | 98 | (251) |
| Carbon | C | 6 | 12,011 |
| Cerium | Ce | 58 | 140,12 |
| Chlor | Cl | 17 | 35,453 |
| Chrom | Cr | 24 | 51,996 |
| Cobalt | Co | 27 | 58,9332 |
| Curium | Cm | 96 | (247) |
| Cæsium | Cs | 55 | 132,9054 |
| Dysprosium | Dy | 66 | 162,50 |
| Einsteinium | Es | 99 | (254) |
| Erbium | Er | 68 | 167,26 |
| Europium | Eu | 63 | 151,86 |
| Fermium | Fm | 100 | (257) |
| Fluor | F | 9 | 18,99840 |
| Francium | Fr | 87 | (223) |
| Gadolinium | Gd | 64 | 157,25 |
| Gallium | Ga | 31 | 69,72 |
| Germanium | Ge | 32 | 72,59 |
| Guld | Au | 79 | 196,9665 |
| Hafnium | Hf | 72 | 178,49 |
| Helium | He | 2 | 4,00260 |
| Holmium | Ho | 67 | 164,9304 |
| Hydrogen | H | 1 | 1,0079 |
| Indium | In | 49 | 114,82 |
| Iod | I | 53 | 126,9045 |
| Iridium | Ir | 77 | 192,22 |
| Jern | Fe | 26 | 55,847 |
| Kalium | K | 19 | 39,098 |
| Kobber | Cu | 29 | 63,546 |
| Krypton | Kr | 36 | 83,80 |
| Kviksølv | Hg | 80 | 200,59 |
| Lanthan | La | 57 | 138,9055 |
| Lawrencium | Lr | 103 | (256) |
| Lithium | Li | 3 | 6,941 |
| Lutetium | Lu | 71 | 174,97 |
| Magnesium | Mg | 12 | 24,305 |
| Mangan | Mn | 25 | 54,9380 |
| Mendelevium | Md | 101 | (258) |
| Molybdæn | Mo | 42 | 95,94 |
| Natrium | Na | 11 | 22,98977 |
| Neodym | Nd | 60 | 144,24 |
| Neon | Ne | 10 | 20,179 |
| Neptunium | Np | 93 | 237,0482 |
| Nikkel | Ni | 28 | 58,71 |
| Niobium | Nb | 41 | 92,9064 |
| Nitrogen | N | 7 | 14,0067 |
| Nobelium | No | 102 | (255) |
| Osmium | Os | 76 | 190,2 |
| Oxygen | O | 8 | 15,9994 |
| Palladium | Pd | 46 | 106,4 |
| Phosphor | P | 15 | 30,97376 |
| Platin | Pt | 78 | 195,09 |
| Plutonium | Pu | 94 | (244) |
| Polonium | Po | 84 | (209) |
| Praseodym | Pr | 59 | 140,9077 |
| Promethium | Pm | 61 | (145) |
| Protactinium | Pa | 91 | 231,0359 |
| Radium | Ra | 88 | 226,0254 |
| Radon | Rn | 86 | (222) |
| Rhenium | Re | 75 | 186,2 |
| Rhodium | Rh | 45 | 102,9055 |
| Rubidium | Rb | 37 | 85,4678 |
| Ruthenium | Ru | 44 | 101,07 |
| Samarium | Sm | 62 | 150,4 |
| Scandium | Sc | 21 | 44,9559 |
| Selen | Se | 34 | 78,96 |
| Silicium | Si | 14 | 28,086 |
| Strontium | Sr | 38 | 87,62 |
| Svovl | S | 16 | 32,06 |
| Sølv | Ag | 47 | 107,868 |
| Tantal | Ta | 73 | 180,9479 |
| Technetium | Tc | 43 | 98,9062 |
| Tellur | Te | 52 | 127,60 |
| Terbium | Tb | 65 | 158,9254 |
| Thallium | Tl | 81 | 204,37 |
| Thorium | Th | 90 | 232,0381 |
| Thulium | Tm | 69 | 168,9342 |
| Tin | Sn | 50 | 118,69 |
| Titan | Ti | 22 | 47,90 |
| Uran | U | 92 | 238,029 |
| Vanadium | V | 23 | 50,9314 |
| Wolfram | W | 74 | 183,85 |
| Xenon | Xe | 54 | 131,30 |
| Ytterbium | Yb | 70 | 173,04 |
| Yttrium | Y | 39 | 88,9059 |
| Zink | Zn | 30 | 65,38 |
| Zirconium | Zr | 40 | 91,22 |
For en del af de radioaktive grundstoffer har den internationale kommission ikke ment det rimeligt at angive nogen atomvægt. Ved disse grundstoffer er i parantes anført massetallet for den isotop, der har længst halveringstid.