Periodesystemet for Grunnstoffer

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    Atomic Symbol Navn Vekt
    1
  1. 1 H Hydrogen 1,008
  2. 2 He Helium 4,0026
  3. 2
  4. 3 Li Litium 6,94
  5. 4 Be Beryllium 9,0122
  6. 5 B Bor 10,81
  7. 6 C Karbon 12,011
  8. 7 N Nitrogen 14,007
  9. 8 O Oksygen 15,999
  10. 9 F Fluor 18,998
  11. 10 Ne Neon 20,180
  12. 3
  13. 11 Na Natrium 22,990
  14. 12 Mg Magnesium 24,305
  15. 13 Al Aluminium 26,982
  16. 14 Si Silisium 28,085
  17. 15 P Fosfor 30,974
  18. 16 S Svovel 32,06
  19. 17 Cl Klor 35,45
  20. 18 Ar Argon 39,948
  21. 4
  22. 19 K Kalium 39,098
  23. 20 Ca Kalsium 40,078
  24. 21 Sc Scandium 44,956
  25. 22 Ti Titan 47,867
  26. 23 V Vanadium 50,942
  27. 24 Cr Krom 51,996
  28. 25 Mn Mangan 54,938
  29. 26 Fe Jern 55,845
  30. 27 Co Kobolt 58,933
  31. 28 Ni Nikkel 58,693
  32. 29 Cu Kobber 63,546
  33. 30 Zn Sink 65,38
  34. 31 Ga Gallium 69,723
  35. 32 Ge Germanium 72,630
  36. 33 As Arsen 74,922
  37. 34 Se Selen 78,971
  38. 35 Br Brom 79,904
  39. 36 Kr Krypton 83,798
  40. 5
  41. 37 Rb Rubidium 85,468
  42. 38 Sr Strontium 87,62
  43. 39 Y Yttrium 88,906
  44. 40 Zr Zirkonium 91,224
  45. 41 Nb Niob 92,906
  46. 42 Mo Molybden 95,95
  47. 43 Tc Technetium (98)
  48. 44 Ru Ruthenium 101,07
  49. 45 Rh Rhodium 102,91
  50. 46 Pd Palladium 106,42
  51. 47 Ag Sølv 107,87
  52. 48 Cd Kadmium 112,41
  53. 49 In Indium 114,82
  54. 50 Sn Tinn 118,71
  55. 51 Sb Antimon 121,76
  56. 52 Te Tellur 127,60
  57. 53 I Jod 126,90
  58. 54 Xe Xenon 131,29
  59. 6
  60. 55 Cs Cesium 132,91
  61. 56 Ba Barium 137,33
  62. 57–71
    6
  63. 57 La Lantan 138,91
  64. 58 Ce Cerium 140,12
  65. 59 Pr Praseodym 140,91
  66. 60 Nd Neodym 144,24
  67. 61 Pm Promethium (145)
  68. 62 Sm Samarium 150,36
  69. 63 Eu Europium 151,96
  70. 64 Gd Gadolinium 157,25
  71. 65 Tb Terbium 158,93
  72. 66 Dy Dysprosium 162,50
  73. 67 Ho Holmium 164,93
  74. 68 Er Erbium 167,26
  75. 69 Tm Thulium 168,93
  76. 70 Yb Ytterbium 173,05
  77. 71 Lu Lutetium 174,97
  78. 72 Hf Hafnium 178,49
  79. 73 Ta Tantal 180,95
  80. 74 W Wolfram 183,84
  81. 75 Re Rhenium 186,21
  82. 76 Os Osmium 190,23
  83. 77 Ir Iridium 192,22
  84. 78 Pt Platina 195,08
  85. 79 Au Gull 196,97
  86. 80 Hg Kvikksølv 200,59
  87. 81 Tl Thallium 204,38
  88. 82 Pb Bly 207,2
  89. 83 Bi Vismut 208,98
  90. 84 Po Polonium (209)
  91. 85 At Astat (210)
  92. 86 Rn Radon (222)
  93. 7
  94. 87 Fr Francium (223)
  95. 88 Ra Radium (226)
  96. 89–103
    7
  97. 89 Ac Actinium (227)
  98. 90 Th Thorium 232,04
  99. 91 Pa Protactinium 231,04
  100. 92 U Uran 238,03
  101. 93 Np Neptunium (237)
  102. 94 Pu Plutonium (244)
  103. 95 Am Americium (243)
  104. 96 Cm Curium (247)
  105. 97 Bk Berkelium (247)
  106. 98 Cf Californium (251)
  107. 99 Es Einsteinium (252)
  108. 100 Fm Fermium (257)
  109. 101 Md Mendelevium (258)
  110. 102 No Nobelium (259)
  111. 103 Lr Lawrencium (266)
  112. 104 Rf Rutherfordium (267)
  113. 105 Db Dubnium (268)
  114. 106 Sg Seaborgium (269)
  115. 107 Bh Bohrium (270)
  116. 108 Hs Hassium (277)
  117. 109 Mt Meitnerium (278)
  118. 110 Ds Darmstadtium (281)
  119. 111 Rg Røntgenium (282)
  120. 112 Cn Copernicium (285)
  121. 113 Nh Nihonium (286)
  122. 114 Fl Flerovium (289)
  123. 115 Mc Moscovium (290)
  124. 116 Lv Livermorium (293)
  125. 117 Ts Tenness (294)
  126. 118 Og Oganesson (294)
  127. For grunnstoffer uten stabile isotoper er massetallet for isotopen med lengst halveringstid oppgitt i parentes.