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Returns number of decimals in atomic weight. Uncertainty is discarded.
Used: when doing crude molar mass calculation (see {{tl|Chem molar mass}}).

Returns: the lowest number of decimals in a formula.
:For starters: (Jan 2019): single element.

Atomic weight values used:
:1. When interval: conventional, abridged value.
:2. When single number value: standard atomic weight (unabridged).
:3. When no stable isotope: mass number (0 decimals).

:Uncertainty, noted as {{val|58.6934|(4)}} (Ni) or {{val|1008}} (H, implicit {{val|1008|(1)}}), is discarded (removed unused).

== Usage ==
:In {{tl|Chem molar mass}}


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