Polyatomic ions

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Common polyatomic ions are:

Cations ammonium, NH4+
Anions nitrate, NO3-
acetate, C2H3O2-
sulfate, SO42-
hydroxide, OH-
phosphate, PO43-
carbonate, CO32-
cyanide, CN-
chlorate, ClO3-
permanganate, MnO4-
chromate, CrO42-
dichromate, Cr2O72-