Its atomic weight between 30.0 and 32.0.
isotopes - The mass numbers of an element's isotopes, which have various masses, are used to identify them. The weighted average of an element's isotopes' masses is used to determine an element's atomic mass.
atomic weight - An atom's mass is its atomic mass. Although the kilogramme is the SI measure of mass, the unified atomic mass unit, or dalton, is a common way to represent atomic mass. An unbound carbon-12 atom in its ground state has a mass of 112 of a Da.
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