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Element (E)
Ar, standard(E)
Table 1[2]
Value type
Ar, std abridged(E)
Table 2[3]
Ar, std conventional(E)
Table 3[4]
Ar, std formal short(E)
Tables 2 and 3[5]
Mass number
[most stable isotope]
hydrogen 1H [1.007841.00811] interval [1.00781.0082] 1.008 1.008
nitrogen 7N [14.0064314.00728] interval [14.00614.008] 14.007 14.007
fluorine 9F 18.998403163(6) number ± uncertainty 18.998 18.998
calcium 20Ca 40.078(4) number ± uncertainty 40.078(4) 40.078(4)
technetium 43Tc (none) most stable isotope [97]

Subtemplates used

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Sources (CIAAW publications)

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  (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Outdated references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}}

See also

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  1. 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.
  2. Meija 2016, Table 1.
  3. Meija 2016, Table 2.
  4. Meija 2016, Table 3.
  5. Meija 2016, Tables 2 and 3.