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Standard atomic weight of the elements (IUPAC 2009–2021[ref 1])
Z Symbol Name Ar, standard Abridged Year changed
1 H hydrogen [1.00784, 1.00811] 1.0080±0.0002 2009
2 He helium 4.002602±0.000002 4.0026±0.0001 1983
3 Li lithium [6.938, 6.997] 6.94±0.06 2009
4 Be beryllium 9.0121831±0.0000005 9.0122±0.0001 2013
5 B boron [10.806, 10.821] 10.81±0.02 2009
6 C carbon [12.0096, 12.0116] 12.011±0.002 2009
7 N nitrogen [14.00643, 14.00728] 14.007±0.001 2009
8 O oxygen [15.99903, 15.99977] 15.999±0.001 2009
9 F fluorine 18.998403162±0.000000005 18.998±0.001 2021
10 Ne neon 20.1797±0.0006 20.180±0.001 1985
11 Na sodium 22.98976928±0.00000002 22.990±0.001 2005
12 Mg magnesium [24.304, 24.307] 24.305±0.002 2011
13 Al aluminium 26.9815384±0.0000003 26.982±0.001 2017
14 Si silicon [28.084, 28.086] 28.085±0.001 2009
15 P phosphorus 30.973761998±0.000000005 30.974±0.001 2013
16 S sulfur [32.059, 32.076] 32.06±0.02 2009
17 Cl chlorine [35.446, 35.457] 35.45±0.01 2009
18 Ar argon [39.792, 39.963] 39.95±0.16 2017
19 K potassium 39.0983±0.0001 39.098±0.001 1979
20 Ca calcium 40.078±0.004 40.078±0.004 1983
21 Sc scandium 44.955907±0.000004 44.956±0.001 2021
22 Ti titanium 47.867±0.001 47.867±0.001 1993
23 V vanadium 50.9415±0.0001 50.942±0.001 1977
24 Cr chromium 51.9961±0.0006 51.996±0.001 1983
25 Mn manganese 54.938043±0.000002 54.938±0.001 2017
26 Fe iron 55.845±0.002 55.845±0.002 1993
27 Co cobalt 58.933194±0.000003 58.933±0.001 2017
28 Ni nickel 58.6934±0.0004 58.693±0.001 2007
29 Cu copper 63.546±0.003 63.546±0.003 1969
30 Zn zinc 65.38±0.02 65.38±0.02 2007
31 Ga gallium 69.723±0.001 69.723±0.001 1987
32 Ge germanium 72.630±0.008 72.630±0.008 2009
33 As arsenic 74.921595±0.000006 74.922±0.001 2013
34 Se selenium 78.971±0.008 78.971±0.008 2013
35 Br bromine [79.901, 79.907] 79.904±0.003 2011
36 Kr krypton 83.798±0.002 83.798±0.002 2001
37 Rb rubidium 85.4678±0.0003 85.468±0.001 1969
38 Sr strontium 87.62±0.01 87.62±0.01 1969
39 Y yttrium 88.905838±0.000002 88.906±0.001 2021
40 Zr zirconium 91.222±0.003 91.222±0.003 2024
41 Nb niobium 92.90637±0.00001 92.906±0.001 2017
42 Mo molybdenum 95.95±0.01 95.95±0.01 2013
43 Tc technetium -
44 Ru ruthenium 101.07±0.02 101.07±0.02 1983
45 Rh rhodium 102.90549±0.00002 102.91±0.01 2017
46 Pd palladium 106.42±0.01 106.42±0.01 1979
47 Ag silver 107.8682±0.0002 107.87±0.01 1985
48 Cd cadmium 112.414±0.004 112.41±0.01 2013
49 In indium 114.818±0.001 114.82±0.01 2011
50 Sn tin 118.710±0.007 118.71±0.01 1983
51 Sb antimony 121.760±0.001 121.76±0.01 1993
52 Te tellurium 127.60±0.03 127.60±0.03 1969
53 I iodine 126.90447±0.00003 126.90±0.01 1985
54 Xe xenon 131.293±0.006 131.29±0.01 1999
55 Cs caesium 132.90545196±0.00000006 132.91±0.01 2013
56 Ba barium 137.327±0.007 137.33±0.01 1985
57 La lanthanum 138.90547±0.00007 138.91±0.01 2005
58 Ce cerium 140.116±0.001 140.12±0.01 1995
59 Pr praseodymium 140.90766±0.00001 140.91±0.01 2017
60 Nd neodymium 144.242±0.003 144.24±0.01 2005
61 Pm promethium
62 Sm samarium 150.36±0.02 150.36±0.02 2005
63 Eu europium 151.964±0.001 151.96±0.01 1995
64 Gd gadolinium 157.249±0.002 157.25±0.01 2024
65 Tb terbium 158.925354±0.000007 158.93±0.01 2021
66 Dy dysprosium 162.500±0.001 162.50±0.01 2001
67 Ho holmium 164.930329±0.000005 164.93±0.01 2021
68 Er erbium 167.259±0.003 167.26±0.01 1999
69 Tm thulium 168.934219±0.000005 168.93±0.01 2021
70 Yb ytterbium 173.045±0.010 173.05±0.02 2015
71 Lu lutetium 174.96669±0.00005 174.97±0.01 2024
72 Hf hafnium 178.486±0.006 178.49±0.01 2019
73 Ta tantalum 180.94788±0.00002 180.95±0.01 2005
74 W tungsten 183.84±0.01 183.84±0.01 1991
75 Re rhenium 186.207±0.001 186.21±0.01 1973
76 Os osmium 190.23±0.03 190.23±0.03 1991
77 Ir iridium 192.217±0.002 192.22±0.01 2017
78 Pt platinum 195.084±0.009 195.08±0.02 2005
79 Au gold 196.966570±0.000004 196.97±0.01 2017
80 Hg mercury 200.592±0.003 200.59±0.01 2011
81 Tl thallium [204.382, 204.385] 204.38±0.01 2009
82 Pb lead [206.14, 207.94] 207.2±1.1 2020
83 Bi bismuth 208.98040±0.00001 208.98±0.01 2005
84 Po polonium -
85 At astatine -
86 Rn radon -
87 Fr francium -
88 Ra radium -
89 Ac actinium -
90 Th thorium 232.0377±0.0004 232.04±0.01 2013
91 Pa protactinium 231.03588±0.00001 231.04±0.01 2017
92 U uranium 238.02891±0.00003 238.03±0.01 1999
93 Np neptunium -
94 Pu plutonium -
95 Am americium -
96 Cm curium -
97 Bk berkelium -
98 Cf californium -
99 Es einsteinium -
100 Fm fermium -
101 Md mendelevium -
102 No nobelium -
103 Lr lawrencium -
104 Rf rutherfordium -
105 Db dubnium -
106 Sg seaborgium -
107 Bh bohrium -
108 Hs hassium -
109 Mt meitnerium -
110 Ds darmstadtium -
111 Rg roentgenium -
112 Cn copernicium -
113 Nh nihonium -
114 Fl flerovium -
115 Mc moscovium -
116 Lv livermorium -
117 Ts tennessine -
118 Og oganesson -
  1. ^
      (This list:
    )
    CIAAW may publish changes to atomic weights (including its precision and derived values). Since 1947, any update this is done in odd years nominally; the actual date of publication may be some time later.
    • 2009 {{CIAAW2009}} (introducing interval notation; Ge):
    "Atomic weights of the elements 2009 (IUPAC Technical Report)". Pure Appl. Chem. 83 (2): 359–396. 12 December 2010. doi:10.1351/PAC-REP-10-09-14.
    "Atomic weights of the elements 2011 (IUPAC Technical Report)". Pure Appl. Chem. 85 (5): 1047–1078. 29 April 2013. doi:10.1351/PAC-REP-13-03-02.
    Meija, Juris; et al. (2016). "Atomic weights of the elements 2013 (IUPAC Technical Report)". Pure and Applied Chemistry. 88 (3): 265–91. doi:10.1515/pac-2015-0305.
    "Standard Atomic Weight of Ytterbium Revised". Chemistry International. 37 (5–6): 26. October 2015. doi:10.1515/ci-2015-0512. eISSN 0193-6484. ISSN 0193-6484.
    "Standard atomic weights of 14 chemical elements revised". CIAAW. 2018-06-05.
    * "2020" is an inconsistent year for change publication: CIAAW maintains that only odd years, changes are publicised.
    • 2021 {{CIAAW2021}} (all elements listed); (4 values changed; introduced new symbol; merge "conventional" into "abridged" columns; change uncertainty notation (use "±")
    Prohaska, Thomas; Irrgeher, Johanna; Benefield, Jacqueline; Böhlke, John K.; Chesson, Lesley A.; Coplen, Tyler B.; Ding, Tiping; Dunn, Philip J. H.; Gröning, Manfred; Holden, Norman E.; Meijer, Harro A. J. (2022-05-04). "Standard atomic weights of the elements 2021 (IUPAC Technical Report)". Pure and Applied Chemistry. doi:10.1515/pac-2019-0603. ISSN 1365-3075.
    Uncertainty handling

    About notation and handling of the uncertainty in the values, including those in [ ] range values:

    Outdated references
    See also: {{Isotopes table/references}}

References

These references will appear in the article, but this list appears only on this page.
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