Standard atomic weight
= Standard atomic weight
{title2=$A_{\rm r}^{\circ}$}
{wiki}
A recommended <atomic weight> applicable to normal materials, rather than the result for every possible enriched sample. The tabulated <neon> value $20.1797(6)$ and the arithmetic result above need not agree in every last displayed digit. Some <chemical elements> have intervals of <standard atomic weight> because their <isotopic abundances> vary across normal materials.<Standard Atomic Weights 2024>{ref}