Common Polyatomic Ions

acetate

CH₃COO^-

carbonate

CO₃^2-

bicarbonate/hydrogen carbonate

HCO₃^-

cyanide

CN^-

hypochlorite

CIO^-

chlorite

CIO₂^-

chlorate

CIO₃^-

perchlorate

CIO₄^-

dichromate

Cr₂O₇^2-

chromate

CrO₄^2-

permanganate

MnO₄^-

azide

N₃^-

ammonium

NH₄⁺

nitrite

NO₂^-

nitrate

NO₃^-

hydroxide

OH^-

peroxide

O₂^2-

phosphate

PO₄^3-

hydrogen phosphate

HPO₄^2-

dihydrogen phosphate

H₂PO₄^-

disulfide

S₂^2-

sulfate

SO₄^2-

bisulfate/hydrogen sulfate

HSO₄^-

sulfite

SO₃^2-

bisulfite/hydrogen sulfite

HSO₃^-

thiocyanate

SCN^-