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 [1.007841.00811] interval 1.0080±0.0002
nitrogen 7N [14.0064314.00728] 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]