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Ammonium
The
ammonium
cation
is a positively
charged
polyatomic ion
with the
chemical formula
NH
4
+
. It is formed by the
protonation
of
ammonia
(NH
3
). Ammonium is also a general name for positively charged or protonated
substituted
amines
and
quaternary ammonium cations
(NR
4
+
), where one or more
hydrogen
atoms
are replaced by organic groups (indicated by
R
).
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