Template:Infobox element/standard atomic weight/value illustration

Element (E)
​
Ar°(E)
Value type
​
Ar°(E), abridged
or conventional
Mass number
[most stable isotope]
hydrogen 1H [1.00784, 1.00811] interval 1.0080±0.0002
nitrogen 7N [14.00643, 14.00728] interval 14.007±0.001
fluorine 9F 18.998403162±0.000000005 number ± uncertainty 18.998±0.001
calcium 20Ca 40.078±0.004 number ± uncertainty 40.078±0.004
technetium 43Tc (none) most stable isotope [97]
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  1. ↑ 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 (in English). doi:10.1515/pac-2019-0603. ISSN 1365-3075.