Grundstoffernes Periodiske System

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    15Pnictogens
    16Chalcogens
    17Halogener
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    3d
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    β⁻
    Betahenfald
     
    Stabil
    Atomic Symbol Navn Vægt
    1
  1. 1 H Brint 1,008
  2. 2 He Helium 4,0026
    3. 2
  3. 3 Li Lithium 6,94
  4. 4 Be Beryllium 9,0122
  5. 5 B Bor 10,81
  6. 6 C Carbon 12,011
  7. 7 N Kvælstof 14,007
  8. 8 O Ilt 15,999
  9. 9 F Fluor 18,998
  10. 10 Ne Neon 20,180
    11. 3
  11. 11 Na Natrium 22,990
  12. 12 Mg Magnesium 24,305
  13. 13 Al Aluminium 26,982
  14. 14 Si Silicium 28,085
  15. 15 P Fosfor 30,974
  16. 16 S Svovl 32,06
  17. 17 Cl Klor 35,45
  18. 18 Ar Argon 39,948
    19. 4
  19. 19 K Kalium 39,098
  20. 20 Ca Calcium 40,078
  21. 21 Sc Scandium 44,956
  22. 22 Ti Titan 47,867
  23. 23 V Vanadium 50,942
  24. 24 Cr Krom 51,996
  25. 25 Mn Mangan 54,938
  26. 26 Fe Jern 55,845
  27. 27 Co Kobolt 58,933
  28. 28 Ni Nikkel 58,693
  29. 29 Cu Kobber 63,546
  30. 30 Zn Zink 65,38
  31. 31 Ga Gallium 69,723
  32. 32 Ge Germanium 72,630
  33. 33 As Arsen 74,922
  34. 34 Se Selen 78,971
  35. 35 Br Brom 79,904
  36. 36 Kr Krypton 83,798
    37. 5
  37. 37 Rb Rubidium 85,468
  38. 38 Sr Strontium 87,62
  39. 39 Y Yttrium 88,906
  40. 40 Zr Zirconium 91,224
  41. 41 Nb Niobium 92,906
  42. 42 Mo Molybdæn 95,95
  43. 43 Tc Technetium (98)
  44. 44 Ru Ruthenium 101,07
  45. 45 Rh Rhodium 102,91
  46. 46 Pd Palladium 106,42
  47. 47 Ag Sølv 107,87
  48. 48 Cd Cadmium 112,41
  49. 49 In Indium 114,82
  50. 50 Sn Tin 118,71
  51. 51 Sb Antimon 121,76
  52. 52 Te Tellur 127,60
  53. 53 I Jod 126,90
  54. 54 Xe Xenon 131,29
    55. 6
  55. 55 Cs Cæsium 132,91
  56. 56 Ba Barium 137,33
    57. 57–71
    6
  57. 57 La Lanthan 138,91
  58. 58 Ce Cerium 140,12
  59. 59 Pr Praseodym 140,91
  60. 60 Nd Neodym 144,24
  61. 61 Pm Promethium (145)
  62. 62 Sm Samarium 150,36
  63. 63 Eu Europium 151,96
  64. 64 Gd Gadolinium 157,25
  65. 65 Tb Terbium 158,93
  66. 66 Dy Dysprosium 162,50
  67. 67 Ho Holmium 164,93
  68. 68 Er Erbium 167,26
  69. 69 Tm Thulium 168,93
  70. 70 Yb Ytterbium 173,05
  71. 71 Lu Lutetium 174,97
  72. 72 Hf Hafnium 178,49
  73. 73 Ta Tantal 180,95
  74. 74 W Wolfram 183,84
  75. 75 Re Rhenium 186,21
  76. 76 Os Osmium 190,23
  77. 77 Ir Iridium 192,22
  78. 78 Pt Platin 195,08
  79. 79 Au Guld 196,97
  80. 80 Hg Kviksølv 200,59
  81. 81 Tl Thallium 204,38
  82. 82 Pb Bly 207,2
  83. 83 Bi Bismuth 208,98
  84. 84 Po Polonium (209)
  85. 85 At Astat (210)
  86. 86 Rn Radon (222)
    87. 7
  87. 87 Fr Francium (223)
  88. 88 Ra Radium (226)
    89. 89–103
    7
  89. 89 Ac Actinium (227)
  90. 90 Th Thorium 232,04
  91. 91 Pa Protactinium 231,04
  92. 92 U Uran 238,03
  93. 93 Np Neptunium (237)
  94. 94 Pu Plutonium (244)
  95. 95 Am Americium (243)
  96. 96 Cm Curium (247)
  97. 97 Bk Berkelium (247)
  98. 98 Cf Californium (251)
  99. 99 Es Einsteinium (252)
  100. 100 Fm Fermium (257)
  101. 101 Md Mendelevium (258)
  102. 102 No Nobelium (259)
  103. 103 Lr Lawrencium (266)
  104. 104 Rf Rutherfordium (267)
  105. 105 Db Dubnium (268)
  106. 106 Sg Seaborgium (269)
  107. 107 Bh Bohrium (270)
  108. 108 Hs Hassium (277)
  109. 109 Mt Meitnerium (278)
  110. 110 Ds Darmstadtium (281)
  111. 111 Rg Røntgenium (282)
  112. 112 Cn Copernicium (285)
  113. 113 Nh Nihonium (286)
  114. 114 Fl Flerovium (289)
  115. 115 Mc Moscovium (290)
  116. 116 Lv Livermorium (293)
  117. 117 Ts Tennessin (294)
  118. 118 Og Oganesson (294)
    119. For grundstoffer uden nogen stabile isotope gælder massen for isotopen med den længste halveringstid.