Galvenās grupas
Periods I A VIII A
 
1.0079
4.0026
1 H He
  1 II A III A IV A VA VI A VII A 2
  6.941 9.0122 10.811 12.011 14.007 15.999 18.998 20.18 6.941    Relatīvā atommasa
2 Li Be B C N O F Ne Li  Simbols
  3 4 5 6 7 8 9 10 3    Atomnumurs
  22.99 24.305 26.982 28.086 30.974 32.065 35.453 39.948
3 Na Mg Al Si P S Cl Ar
  11 12 13 14 15 16 17 18
  39.098 40.08 69.723 72.64 74.922 78.96 79.904 83.798
4 K Ca Ga Ge As Se Br Kr
  19 20 31 32 33 34 35 36
  85.468 87.62 114.82 118.71 121.76 127.6 126.9 131.29
5 Rb Sr In Sn Sb Te I Xe
  37 38 49 50 51 52 53 54
  132.91 137.33 204.38 207.2 208.98 (209) (210) (222)
6 Cs Ba Tl Pb Bi Po At Rn
  55 56 81 82 83 84 85 86
  (223) (226) (284) (289) (288) (292)   (294)
7 Fr Ra Uut Uuq Uup Uuh Uus Uuo
  87 88 113 114 115 116 117 118