1 H 氢 1.0080 2 He 氦 4.0026 3 Li 锂 6.94 4 Be 铍 9.0122 5 B 硼 10.81 6 C 碳 12.011 7 N 氮 14.007 8 O 氧 15.999 9 F 氟 18.998 10 Ne 氖 20.180 11 Na 钠 22.990 12 Mg 镁 24.305 13 Al 铝 26.982 14 Si 硅 28.0855 15 P 磷 30.974 16 S 硫 32.06 17 Cl 氯 35.45 18 Ar 氩 39.95 19 K 钾 39.098 20 Ca 钙 40.078 21 Sc 钪 44.956 22 Ti 钛 47.867 23 V 钒 50.942 24 Cr 铬 51.996 25 Mn 锰 54.938 26 Fe 铁 55.845 27 Co 钴 58.933 28 Ni 镍 58.693 29 Cu 铜 63.546 30 Zn 锌 65.38 31 Ga 镓 69.723 32 Ge 锗 72.630 33 As 砷 74.922 34 Se 硒 78.971 35 Br 溴 79.904 36 Kr 氪 83.798 37 Rb 铷 85.468 38 Sr 锶 87.62 39 Y 钇 88.906 40 Zr 锆 91.224 41 Nb 铌 92.906 42 Mo 钼 95.95 43 Tc 锝 [97] 44 Ru 钌 101.07 45 Rh 铑 102.91 46 Pd 钯 106.42 47 Ag 银 107.87 48 Cd 镉 112.41 49 In 铟 114.82 50 Sn 锡 118.71 51 Sb 锑 121.76 52 Te 碲 127.60 53 I 碘 126.90 54 Xe 氙 131.29 55 Cs 铯 132.91 56 Ba 钡 137.33 72 Hf 铪 178.49 73 Ta 钽 180.95 74 W 钨 183.84 75 Re 铼 186.21 76 Os 锇 190.23 77 Ir 铱 192.22 78 Pt 铂 195.08 79 Au 金 196.97 80 Hg 汞 200.59 81 Tl 铊 204.38 82 Pb 铅 207.2 83 Bi 铋 208.98 84 Po 钋 [209] 85 At 砹 [210] 86 Rn 氡 [222] 87 Fr 钫 [223] 88 Ra 镭 [226] 104 Rf 𬬻 [267] 105 Db 𬭊 [268] 106 Sg 𬭳 [269] 107 Bh 𬭛 [270] 108 Hs 𬭶 [269] 109 Mt 鿏 [277] 110 Ds 𫟼 [281] 111 Rg 𬬭 [282] 112 Cn 鿔 [285] 113 Nh 鉨 [286] 114 Fl 𫓧 [290] 115 Mc 镆 [290] 116 Lv [293] 117 Ts [294] 118 Og [294] 119 Uue [316] 120 Ubn [320] 57 La 镧 138.91 58 Ce 铈 140.12 59 Pr 镨 140.91 60 Nd 钕 144.24 61 Pm 钷 [145] 62 Sm 钐 150.36 63 Eu 铕 151.96 64 Gd 钆 157.25 65 Tb 铽 158.93 66 Dy 镝 162.50 67 Ho 钬 164.93 68 Er 铒 167.26 69 Tm 铥 168.93 70 Yb 镱 173.05 71 Lu 镥 174.97 89 Ac 锕 [227] 90 Th 钍 232.04 91 Pa 镤 231.04 92 U 铀 238.03 93 Np 镎 [237] 94 Pu 鈽 [244] 95 Am 镅 [243] 96 Cm 锔 [247] 97 Bk 锫 [247] 98 Cf 锎 [251] 99 Es 锿 [252] 100 Fm 镄 [257] 101 Md 钔 [258] 102 No 锘 [259] 103 Lr 铹 [262]