相对原子质量表

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本相对原子质量表按原子序数排。
本表数据源自2022年IUPAC元素周期表（IUPAC 2022 standard atomic weights）（页面存档备份，存于），單同位素質量源自2021年版各元素标准原子质量（IUPAC技术报告） （页面存档备份，存于），以碳十二＝12为标准。
本表［］内的原子质量为放射元素（除铋、钍、镤、铀，虽然这些元素没有稳定同位素，但有天然放射同位素鉍209，釷232，鏷231，鈾235、238，故仍可給予标準原子量）最长半衰期的同位素质量数。
| 原子序 | 元素名 | 符号 | 標準原子质量 | 不確定度 | 單同位素質量 |
| --- | --- | --- | --- | --- | --- |
| 1 | 氢 | H | 1.0080 | ±0.0002 |  |
| 2 | 氦 | He | 4.0026 | ±0.0001 |  |
| 3 | 锂 | Li | 6.94 | ±0.06 |  |
| 4 | 铍 | Be | 9.0122 | ±0.0001 | 9.0121 831±0.0000 005 |
| 5 | 硼 | B | 10.81 | ±0.02 |  |
| 6 | 碳 | C | 12.011 | ±0.002 |  |
| 7 | 氮 | N | 14.007 | ±0.001 |  |
| 8 | 氧 | O | 15.999 | ±0.001 |  |
| 9 | 氟 | F | 18.998 | ±0.001 |  |
| 10 | 氖 | Ne | 20.180 | ±0.001 |  |
| 11 | 钠 | Na | 22.990 | ±0.001 |  |
| 12 | 镁 | Mg | 24.305 | ±0.002 |  |
| 13 | 铝 | Al | 26.982 | ±0.001 |  |
| 14 | 硅 | Si | 28.0855 | ±0.001 |  |
| 15 | 磷 | P | 30.974 | ±0.001 |  |
| 16 | 硫 | S | 32.06 | ±0.02 |  |
| 17 | 氯 | Cl | 35.45 | ±0.01 |  |
| 18 | 氩 | Ar | 39.95 | ±0.16 |  |
| 19 | 钾 | K | 39.098 | ±0.001 |  |
| 20 | 钙 | Ca | 40.078 | ±0.004 |  |
| 21 | 钪 | Sc | 44.956 | ±0.0001 |  |
| 22 | 钛 | Ti | 47.867 | ±0.001 |  |
| 23 | 钒 | V | 50.942 | ±0.001 |  |
| 24 | 铬 | Cr | 51.996 | ±0.001 |  |
| 25 | 锰 | Mn | 54.938 | ±0.001 |  |
| 26 | 铁 | Fe | 55.845 | ±0.002 |  |
| 27 | 钴 | Co | 58.933 | ±0.001 |  |
| 28 | 镍 | Ni | 58.693 | ±0.001 |  |
| 29 | 铜 | Cu | 63.546 | ±0.003 |  |
| 30 | 锌 | Zn | 65.38 | ±0.02 |  |
| 31 | 镓 | Ga | 69.723 | ±0.001 |  |
| 32 | 锗 | Ge | 72.630 | ±0.008 |  |
| 33 | 砷 | As | 74.922 | ±0.001 |  |
| 34 | 硒 | Se | 78.971 | ±0.008 |  |
| 35 | 溴 | Br | 79.904 | ±0.003 |  |
| 36 | 氪 | Kr | 83.798 | ±0.002 |  |
| 37 | 铷 | Rb | 85.468 | ±0.001 |  |
| 38 | 锶 | Sr | 87.62 | ±0.01 |  |
| 39 | 钇 | Y | 88.906 | ±0.001 |  |
| 40 | 锆 | Zr | 91.224 | ±0.002 |  |
| 41 | 铌 | Nb | 92.906 | ±0.001 |  |
| 42 | 钼 | Mo | 95.95 | ±0.01 |  |
| 43 | 锝 | Tc | ［97］ |  |  |
| 44 | 钌 | Ru | 101.07 | ±0.02 |  |
| 45 | 铑 | Rh | 102.91 | ±0.01 |  |
| 46 | 钯 | Pd | 106.42 | ±0.01 |  |
| 47 | 银 | Ag | 107.87 | ±0.01 |  |
| 48 | 镉 | Cd | 112.41 | ±0.01 |  |
| 49 | 铟 | In | 114.82 | ±0.01 |  |
| 50 | 锡 | Sn | 118.71 | ±0.01 |  |
| 51 | 锑 | Sb | 121.76 | ±0.01 |  |
| 52 | 碲 | Te | 127.60 | ±0.03 |  |
| 53 | 碘 | I | 126.90 | ±0.01 |  |
| 54 | 氙 | Xe | 131.29 | ±0.01 |  |
| 55 | 铯 | Cs | 132.91 | ±0.01 |  |
| 56 | 钡 | Ba | 137.33 | ±0.01 |  |
| 57 | 镧 | La | 138.91 | ±0.01 |  |
| 58 | 铈 | Ce | 140.12 | ±0.01 |  |
| 59 | 镨 | Pr | 140.91 | ±0.01 |  |
| 60 | 钕 | Nd | 144.24 | ±0.01 |  |
| 61 | 钷 | Pm | ［145］ |  |  |
| 62 | 钐 | Sm | 150.36 | ±0.02 |  |
| 63 | 铕 | Eu | 151.96 | ±0.01 |  |
| 64 | 钆 | Gd | 157.25 | ±0.03 |  |
| 65 | 铽 | Tb | 158.93 | ±0.01 | Tb159，穩定，158.925 354±0.000 007 |
| 66 | 镝 | Dy | 162.50 | ±0.01 |  |
| 67 | 钬 | Ho | 164.93 | ±0.01 |  |
| 68 | 铒 | Er | 167.26 | ±0.01 |  |
| 69 | 铥 | Tm | 168.93 | ±0.01 |  |
| 70 | 镱 | Yb | 173.05 | ±0.02 |  |
| 71 | 镥 | Lu | 174.97 | ±0.01 |  |
| 72 | 铪 | Hf | 178.49 | ±0.01 |  |
| 73 | 钽 | Ta | 180.95 | ±0.01 |  |
| 74 | 钨 | W | 183.84 | ±0.01 |  |
| 75 | 铼 | Re | 186.21 | ±0.01 |  |
| 76 | 锇 | Os | 190.23 | ±0.03 |  |
| 77 | 铱 | Ir | 192.22 | ±0.01 |  |
| 78 | 铂 | Pt | 195.08 | ±0.02 |  |
| 79 | 金 | Au | 196.97 | ±0.01 |  |
| 80 | 汞 | Hg | 200.59 | ±0.01 |  |
| 81 | 铊 | Tl | 204.38 | ±0.01 |  |
| 82 | 铅 | Pb | 207.2 | ±1.1 |  |
| 83 | 铋 | Bi | 208.98 | ±0.01 |  |
| 84 | 钋 | Po | ［209］ |  |  |
| 85 | 砹 | At | ［210］ |  |  |
| 86 | 氡 | Rn | ［222］ |  |  |
| 87 | 钫 | Fr | ［223］ |  |  |
| 88 | 镭 | Ra | ［226］ |  |  |
| 89 | 锕 | Ac | ［227］ |  |  |
| 90 | 钍 | Th | 232.04 | ±0.01 |  |
| 91 | 镤 | Pa | 231.04 | ±0.01 |  |
| 92 | 铀 | U | 238.03 | ±0.01 |  |
| 93 | 镎 | Np | ［237］ |  |  |
| 94 | 钚 | Pu | ［244］ |  |  |
| 95 | 镅 | Am | ［243］ |  |  |
| 96 | 锔 | Cm | ［247］ |  |  |
| 97 | 锫 | Bk | ［247］ |  |  |
| 98 | 锎 | Cf | ［251］ |  |  |
| 99 | 锿 | Es | ［252］ |  |  |
| 100 | 镄 | Fm | ［257］ |  |  |
| 101 | 钔 | Md | ［258］ |  |  |
| 102 | 锘 | No | ［259］ |  |  |
| 103 | 铹 | Lr | ［262］ |  |  |
| 104 | 鑪 | Rf | ［267］ |  |  |
| 105 | 𨧀 | Db | ［268］ |  |  |
| 106 | 𨭎 | Sg | ［269］ |  |  |
| 107 | 𨨏 | Bh | ［270］ |  |  |
| 108 | 𨭆 | Hs | ［269］ |  |  |
| 109 | 䥑 | Mt | ［277］ |  |  |
| 110 | 鐽 | Ds | ［281］ |  |  |
| 111 | 錀 | Rg | ［282］ |  |  |
| 112 | 鎶 | Cn | ［285］ |  |  |
| 113 | 鉨 | Nh | ［286］ |  |  |
| 114 | 鈇 | Fl | ［290］ |  |  |
| 115 | 镆 | Mc | ［290］ |  |  |
| 116 | 鉝 | Lv | ［293］ |  |  |
| 117 | 鿬 | Ts | ［294］ |  |  |
| 118 | 鿫 | Og | ［294］ |  |  |