Common polyatomic ions

[H3O]+

hydronium

[OH]-

hydroxide

[NH4]+

ammonium

[NO3]-

nitrate

[NO2]-

nitrite

[CN]-

cyanide

[CNO]-

cyanate

\[CNS\]-

thiocyanate

[HSO4]-

hydrogen sulfate

[SO4]2-

sulfate

[PO4]3-

phosphate

[HPO4]2-

hydrogen phosphate

[H2PO4]-

dihydrogen phosphate

[PO3]3-

phosphite

[CO3]2-

carbonate

[HCO3]-

hydrogen carbonate

[O2]2-

peroxide

[C2H3O2]-

acetate

[ClO4]-

perchlorate

[ClO3]-

chlorate

[ClO2]-

chlorite

[ClO]-

hypochlorite

[CrO4]2-

chromate

[Cr2O7]2-

dichromate

[MnO4]-

permanganate

\[AsO4\]3-

arsenate

\[AsO3\]3-

arsenite