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Wikipedia: Complex ion
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An ion consisting of multiple atoms associated together by [covalent bond]?s which can be considered as acting as a single unit in the context of acid/base chemistry or in the formation of salts.
Some commonly-occuring complex ions and their charges are
indicated below
carbonate CO32-
bicarbonate HCO3-
nitrate NO3-
phosphate PO43-
sulfate? SO42-
acetate? CH3C(=O)O-
ammonium? NH4+
hydroxide? OH-
pyridinium? C5H5NH+