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Standard atomic weights of the elements overview page (data)
Z Symbol Name Ar°(E)
2021: Table 1, columns 4, 5 		Type
  		Abridged
columns 7, 8 		g, m, r m.s.i. Year changed

1 H hydrogen [1.00784, 1.00811] 2 1.0080±0.0002 m 2009[1]
2 He helium 4.002602±0.000002 1 4.0026±0.0001 g, r 1983[2]
3 Li lithium [6.938, 6.997] 2 6.94±0.06 m 2009[3]
4 Be beryllium 9.0121831±0.0000005 1 9.0122±0.0001 2013[4]
5 B boron [10.806, 10.821] 2 10.81±0.02 m 2009[5]
6 C carbon [12.0096, 12.0116] 2 12.011±0.002 2009[6]
7 N nitrogen [14.00643, 14.00728] 2 14.007±0.001 m 2009[7]
8 O oxygen [15.99903, 15.99977] 2 15.999±0.001 m 2009[8]
9 F fluorine 18.998403162±0.000000005 1 18.998±0.001 2021[9]
10 Ne neon 20.1797±0.0006 1 20.180±0.001 g, m 1985[10]
11 Na sodium 22.98976928±0.00000002 1 22.990±0.001 2005[11]
12 Mg magnesium [24.304, 24.307] 2 24.305±0.002 2011[12]
13 Al aluminium 26.9815384±0.0000003 1 26.982±0.001 2017[13]
14 Si silicon [28.084, 28.086] 2 28.085±0.001 2009[14]
15 P phosphorus 30.973761998±0.000000005 1 30.974±0.001 2013[15]
16 S sulfur [32.059, 32.076] 2 32.06±0.02 2009[16]
17 Cl chlorine [35.446, 35.457] 2 35.45±0.01 m 2009[17]
18 Ar argon [39.792, 39.963] 2 39.95±0.16 2017[18]
19 K potassium 39.0983±0.0001 1 39.098±0.001 1979[19]
20 Ca calcium 40.078±0.004 1 40.078±0.004 g 1983[20]
21 Sc scandium 44.955907±0.000004 1 44.956±0.001 2021[21]
22 Ti titanium 47.867±0.001 1 47.867±0.001 1993[22]
23 V vanadium 50.9415±0.0001 1 50.942±0.001 1977[23]
24 Cr chromium 51.9961±0.0006 1 51.996±0.001 1983[24]
25 Mn manganese 54.938043±0.000002 1 54.938±0.001 2017[25]
26 Fe iron 55.845±0.002 1 55.845±0.002 1993[26]
27 Co cobalt 58.933194±0.000003 1 58.933±0.001 2017[27]
28 Ni nickel 58.6934±0.0004 1 58.693±0.001 r 2007[28]
29 Cu copper 63.546±0.003 1 63.546±0.003 r 1969[29]
30 Zn zinc 65.38±0.02 1 65.38±0.02 r 2007[30]
31 Ga gallium 69.723±0.001 1 69.723±0.001 1987[31]
32 Ge germanium 72.630±0.008 1 72.630±0.008 2009[32]
33 As arsenic 74.921595±0.000006 1 74.922±0.001 2013[33]
34 Se selenium 78.971±0.008 1 78.971±0.008 r 2013[34]
35 Br bromine [79.901, 79.907] 2 79.904±0.003 2011[35]
36 Kr krypton 83.798±0.002 1 83.798±0.002 g, m 2001[36]
37 Rb rubidium 85.4678±0.0003 1 85.468±0.001 g 1969[37]
38 Sr strontium 87.62±0.01 1 87.62±0.01 g, r 1969[38]
39 Y yttrium 88.905838±0.000002 1 88.906±0.001 2021[39]
40 Zr zirconium 91.222±0.003 1 91.222±0.003 g 2024[40]
41 Nb niobium 92.90637±0.00001 1 92.906±0.001 2017[41]
42 Mo molybdenum 95.95±0.01 1 95.95±0.01 g 2013[42]
43 Tc technetium - 3 [97]
44 Ru ruthenium 101.07±0.02 1 101.07±0.02 g 1983[43]
45 Rh rhodium 102.90549±0.00002 1 102.91±0.01 2017[44]
46 Pd palladium 106.42±0.01 1 106.42±0.01 g 1979[45]
47 Ag silver 107.8682±0.0002 1 107.87±0.01 g 1985[46]
48 Cd cadmium 112.414±0.004 1 112.41±0.01 g 2013[47]
49 In indium 114.818±0.001 1 114.82±0.01 2011[48]
50 Sn tin 118.710±0.007 1 118.71±0.01 g 1983[49]
51 Sb antimony 121.760±0.001 1 121.76±0.01 g 1993[50]
52 Te tellurium 127.60±0.03 1 127.60±0.03 g 1969[51]
53 I iodine 126.90447±0.00003 1 126.90±0.01 1985[52]
54 Xe xenon 131.293±0.006 1 131.29±0.01 g, m 1999[53]
55 Cs caesium 132.90545196±0.00000006 1 132.91±0.01 2013[54]
56 Ba barium 137.327±0.007 1 137.33±0.01 1985[55]
57 La lanthanum 138.90547±0.00007 1 138.91±0.01 g 2005[56]
58 Ce cerium 140.116±0.001 1 140.12±0.01 g 1995[57]
59 Pr praseodymium 140.90766±0.00001 1 140.91±0.01 2017[58]
60 Nd neodymium 144.242±0.003 1 144.24±0.01 g 2005[59]
61 Pm promethium 3 [145]
62 Sm samarium 150.36±0.02 1 150.36±0.02 g 2005[60]
63 Eu europium 151.964±0.001 1 151.96±0.01 g 1995[61]
64 Gd gadolinium 157.249±0.002 1 157.25±0.01 g 2024[62]
65 Tb terbium 158.925354±0.000007 1 158.93±0.01 2021[63]
66 Dy dysprosium 162.500±0.001 1 162.50±0.01 g 2001[64]
67 Ho holmium 164.930329±0.000005 1 164.93±0.01 2021[65]
68 Er erbium 167.259±0.003 1 167.26±0.01 g 1999[66]
69 Tm thulium 168.934219±0.000005 1 168.93±0.01 2021[67]
70 Yb ytterbium 173.045±0.010 1 173.05±0.02 g 2015[68]
71 Lu lutetium 174.96669±0.00005 1 174.97±0.01 g 2024[69]
72 Hf hafnium 178.486±0.006 1 178.49±0.01 g 2019[70]
73 Ta tantalum 180.94788±0.00002 1 180.95±0.01 2005[71]
74 W tungsten 183.84±0.01 1 183.84±0.01 1991[72]
75 Re rhenium 186.207±0.001 1 186.21±0.01 1973[73]
76 Os osmium 190.23±0.03 1 190.23±0.03 g 1991[74]
77 Ir iridium 192.217±0.002 1 192.22±0.01 2017[75]
78 Pt platinum 195.084±0.009 1 195.08±0.02 2005[76]
79 Au gold 196.966570±0.000004 1 196.97±0.01 2017[77]
80 Hg mercury 200.592±0.003 1 200.59±0.01 2011[78]
81 Tl thallium [204.382, 204.385] 2 204.38±0.01 2009[79]
82 Pb lead [206.14, 207.94] 2 207.2±1.1 2020[80]
83 Bi bismuth 208.98040±0.00001 1 208.98±0.01 2005[81]
84 Po polonium - 3 [209]
85 At astatine - 3 [210]
86 Rn radon - 3 [222]
87 Fr francium - 3 [223]
88 Ra radium - 3 [226]
89 Ac actinium - 3 [227]
90 Th thorium 232.0377±0.0004 1 232.04±0.01 g 2013[82]
91 Pa protactinium 231.03588±0.00001 1 231.04±0.01 2017[83]
92 U uranium 238.02891±0.00003 1 238.03±0.01 g, m 1999[84]
93 Np neptunium - 3 [237]
94 Pu plutonium - 3 [244]
95 Am americium - 3 [243]
96 Cm curium - 3 [247]
97 Bk berkelium - 3 [247]
98 Cf californium - 3 [251]
99 Es einsteinium - 3 [252]
100 Fm fermium - 3 [257]
101 Md mendelevium - 3 [258]
102 No nobelium - 3 [259]
103 Lr lawrencium - 3 [266]
104 Rf rutherfordium - 3 [267]
105 Db dubnium - 3 [268]
106 Sg seaborgium - 3 [267]
107 Bh bohrium - 3 [270]
108 Hs hassium - 3 [271]
109 Mt meitnerium - 3 [278]
110 Ds darmstadtium - 3 [281]
111 Rg roentgenium - 3 [282]
112 Cn copernicium - 3 [285]
113 Nh nihonium - 3 [286]
114 Fl flerovium - 3 [289]
115 Mc moscovium - 3 [290]
116 Lv livermorium - 3 [293]
117 Ts tennessine - 3 [294]
118 Og oganesson - 3 [294]
119 Uue ununennium -
120 Ubn unbinilium -
121 Ubu unbiunium -
122 Ubb unbibium -
124 Ubq unbiquadium -
126 Ubh unbihexium -
g Geological and biological materials are known in which the element has an isotopic composition outside the limits for normal material. The difference between the atomic weight of the element in such materials and that given in the table may exceed the stated uncertainty.
m Modified isotopic compositions may be found in commercially available material because the material has been subjected to some undisclosed or inadvertent isotopic fractionation. Substantial deviations in atomic weight of the element from that given in the table can occur.
r Range in isotopic composition of normal terrestrial material prevents a more precise standard atomic weight being given; the tabulated value and uncertainty should be applicable to normal material.
  1. ^ "Standard Atomic Weights: Hydrogen". CIAAW. 2009.
  2. ^ "Standard Atomic Weights: Helium". CIAAW. 1983.
  3. ^ "Standard Atomic Weights: Lithium". CIAAW. 2009.
  4. ^ "Standard Atomic Weights: Beryllium". CIAAW. 2013.
  5. ^ "Standard Atomic Weights: Boron". CIAAW. 2009.
  6. ^ "Standard Atomic Weights: Carbon". CIAAW. 2009.
  7. ^ "Standard Atomic Weights: Nitrogen". CIAAW. 2009.
  8. ^ "Standard Atomic Weights: Oxygen". CIAAW. 2009.
  9. ^ "Standard Atomic Weights: Fluorine". CIAAW. 2021.
  10. ^ "Standard Atomic Weights: Neon". CIAAW. 1985.
  11. ^ "Standard Atomic Weights: Sodium". CIAAW. 2005.
  12. ^ "Standard Atomic Weights: Magnesium". CIAAW. 2011.
  13. ^ "Standard Atomic Weights: Aluminium". CIAAW. 2017.
  14. ^ "Standard Atomic Weights: Silicon". CIAAW. 2009.
  15. ^ "Standard Atomic Weights: Phosphorus". CIAAW. 2013.
  16. ^ "Standard Atomic Weights: Sulfur". CIAAW. 2009.
  17. ^ "Standard Atomic Weights: Chlorine". CIAAW. 2009.
  18. ^ "Standard Atomic Weights: Argon". CIAAW. 2017.
  19. ^ "Standard Atomic Weights: Potassium". CIAAW. 1979.
  20. ^ "Standard Atomic Weights: Calcium". CIAAW. 1983.
  21. ^ "Standard Atomic Weights: Scandium". CIAAW. 2021.
  22. ^ "Standard Atomic Weights: Titanium". CIAAW. 1993.
  23. ^ "Standard Atomic Weights: Vanadium". CIAAW. 1977.
  24. ^ "Standard Atomic Weights: Chromium". CIAAW. 1983.
  25. ^ "Standard Atomic Weights: Manganese". CIAAW. 2017.
  26. ^ "Standard Atomic Weights: Iron". CIAAW. 1993.
  27. ^ "Standard Atomic Weights: Cobalt". CIAAW. 2017.
  28. ^ "Standard Atomic Weights: Nickel". CIAAW. 2007.
  29. ^ "Standard Atomic Weights: Copper". CIAAW. 1969.
  30. ^ "Standard Atomic Weights: Zinc". CIAAW. 2007.
  31. ^ "Standard Atomic Weights: Gallium". CIAAW. 1987.
  32. ^ "Standard Atomic Weights: Germanium". CIAAW. 2009.
  33. ^ "Standard Atomic Weights: Arsenic". CIAAW. 2013.
  34. ^ "Standard Atomic Weights: Selenium". CIAAW. 2013.
  35. ^ "Standard Atomic Weights: Bromine". CIAAW. 2011.
  36. ^ "Standard Atomic Weights: Krypton". CIAAW. 2001.
  37. ^ "Standard Atomic Weights: Rubidium". CIAAW. 1969.
  38. ^ "Standard Atomic Weights: Strontium". CIAAW. 1969.
  39. ^ "Standard Atomic Weights: Yttrium". CIAAW. 2021.
  40. ^ "Standard Atomic Weights: Zirconium". CIAAW. 2024.
  41. ^ "Standard Atomic Weights: Niobium". CIAAW. 2017.
  42. ^ "Standard Atomic Weights: Molybdenum". CIAAW. 2013.
  43. ^ "Standard Atomic Weights: Ruthenium". CIAAW. 1983.
  44. ^ "Standard Atomic Weights: Rhodium". CIAAW. 2017.
  45. ^ "Standard Atomic Weights: Palladium". CIAAW. 1979.
  46. ^ "Standard Atomic Weights: Silver". CIAAW. 1985.
  47. ^ "Standard Atomic Weights: Cadmium". CIAAW. 2013.
  48. ^ "Standard Atomic Weights: Indium". CIAAW. 2011.
  49. ^ "Standard Atomic Weights: Tin". CIAAW. 1983.
  50. ^ "Standard Atomic Weights: Antimony". CIAAW. 1993.
  51. ^ "Standard Atomic Weights: Tellurium". CIAAW. 1969.
  52. ^ "Standard Atomic Weights: Iodine". CIAAW. 1985.
  53. ^ "Standard Atomic Weights: Xenon". CIAAW. 1999.
  54. ^ "Standard Atomic Weights: Caesium". CIAAW. 2013.
  55. ^ "Standard Atomic Weights: Barium". CIAAW. 1985.
  56. ^ "Standard Atomic Weights: Lanthanum". CIAAW. 2005.
  57. ^ "Standard Atomic Weights: Cerium". CIAAW. 1995.
  58. ^ "Standard Atomic Weights: Praseodymium". CIAAW. 2017.
  59. ^ "Standard Atomic Weights: Neodymium". CIAAW. 2005.
  60. ^ "Standard Atomic Weights: Samarium". CIAAW. 2005.
  61. ^ "Standard Atomic Weights: Europium". CIAAW. 1995.
  62. ^ "Standard Atomic Weights: Gadolinium". CIAAW. 2024.
  63. ^ "Standard Atomic Weights: Terbium". CIAAW. 2021.
  64. ^ "Standard Atomic Weights: Dysprosium". CIAAW. 2001.
  65. ^ "Standard Atomic Weights: Holmium". CIAAW. 2021.
  66. ^ "Standard Atomic Weights: Erbium". CIAAW. 1999.
  67. ^ "Standard Atomic Weights: Thulium". CIAAW. 2021.
  68. ^ "Standard Atomic Weights: Ytterbium". CIAAW. 2015.
  69. ^ "Standard Atomic Weights: Lutetium". CIAAW. 2024.
  70. ^ "Standard Atomic Weights: Hafnium". CIAAW. 2019.
  71. ^ "Standard Atomic Weights: Tantalum". CIAAW. 2005.
  72. ^ "Standard Atomic Weights: Tungsten". CIAAW. 1991.
  73. ^ "Standard Atomic Weights: Rhenium". CIAAW. 1973.
  74. ^ "Standard Atomic Weights: Osmium". CIAAW. 1991.
  75. ^ "Standard Atomic Weights: Iridium". CIAAW. 2017.
  76. ^ "Standard Atomic Weights: Platinum". CIAAW. 2005.
  77. ^ "Standard Atomic Weights: Gold". CIAAW. 2017.
  78. ^ "Standard Atomic Weights: Mercury". CIAAW. 2011.
  79. ^ "Standard Atomic Weights: Thallium". CIAAW. 2009.
  80. ^ "Standard Atomic Weights: Lead". CIAAW. 2020.
  81. ^ "Standard Atomic Weights: Bismuth". CIAAW. 2005.
  82. ^ "Standard Atomic Weights: Thorium". CIAAW. 2013.
  83. ^ "Standard Atomic Weights: Protactinium". CIAAW. 2017.
  84. ^ "Standard Atomic Weights: Uranium". CIAAW. 1999.

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