Common Polyatomic Ions

CO_3^2-

carbonate

HCO₃^-

bicarbonate

C₂O₄^2-

oxalate

CH₃COO^-

ethanoate

C₂H₃O₂^-

acetate

CN^-

cyanide

SCN^-

thiocyanate

SO₄^2-

sulfate

SO₃^2-

sulfite

HSO₄^-

bisulfate

HSO₃^-

bisulfite

PO₄^3-

phosphate

PO₃^3-

phosphite

BO₃^3-

borate

NH₄⁺

ammonium

NO₃^-

nitrate

NO₂^-

nitrite

CrO₄^2-

chromate

Cr₂O₇^2-

dichromate

MNO₄^-

permanganate

ClO₄^-

perchlorate

ClO₃^-

chlorate

ClO₂^-

chlorite

ClO^-

hypochlorite

OH^-

hydroxide

IO₃^-

iodate