1 氢 H 1.007 94(7)
2 氦 He 4.002 602(2)
3 锂 Li 6.941(2)
4 铍 Be 9.012 182(3)
5 硼 B 10.811(7)
6 碳 C 12.0107(8)
7 氮 N 14.006 7(2)
8 氧 O 15.999 4(3)
9 氟 F 18.998 403 2(5)
10 氖 Ne 20.179 7(6)
11 钠 Na 22.989 769 28(2)
12 镁 Mg 24.305 0(6)
13 铝 Al 26.981 538 6(8)
14 硅 Si 28.085 5(3)
15 磷 P 30.973 762(2)
16 硫 S 32.065(5)
17 氯 Cl 35.453(2)
18 氩 Ar 39.948(1)
19 钾 K 39.098 3(1)
20 钙 Ca 40.078(4)
21 钪 Sc 44.955 912(6)
22 钛 Ti 47.867(1)
23 钒 V 50.941 5(1)
24 铬 Cr 51.996 1(6)
25 锰 Mn 54.938 045(5)
26 铁 Fe 55.845(2
27 钴 Co 58.933 195(5)
28 镍 Ni 58.693 4(2)
29 铜 Cu 63.546(3)
30 锌 Zn 65.39(4)
31 镓 Ga 69.723(1)
32 锗 Ge 72.64(1)
33 砷 As 74.921 60(2
34 硒 Se 78.96(3)
35 溴 Br 79.904(1)
36 氪 Kr 83.798(2)