Overview: formal value types of the standard atomic weight[1]
Element (E)
Ar°(E)
Value type
Ar°(E), abridged
or conventional
Mass number
[most stable isotope]
hydrogen 1H interval 1.0080±0.0002
nitrogen 7N interval 14.007±0.001
fluorine 9F number ± uncertainty 18.998±0.001
calcium 20Ca number ± uncertainty 40.078±0.004
technetium 43Tc (none) most stable isotope

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