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A monatomic ion (also called simple ion
[1]
[2]) is an
ion consisting of exactly one atom. If, instead of being monatomic, an ion contains more than one atom, even if these are of the same element, it is called a
polyatomic ion.
[3] For example, calcium carbonate consists of the monatomic
cation Ca2+ and the polyatomic
anion CO2−
3; both
pentazenium (N+5) and
azide (N−3) are polyatomic as well.