polyatomic ions

acetate

C₂H₃O₂^-

ammonium

NH₄⁺

bromate

BrO₃^-

carbonate

CO₃^2-

bicarbonate

HCO₃^-

chlorate

ClO₃^-

chlorite

ClO₂^-

hypochlorite

ClO^-

perchlorate

ClO₄^-

chromate

CrO₄^2-

dicrhomate

Cr₂O₇^2-

cyanide

CN^-

hydroxide

OH^-

manganate

MnO₄^2-

nitrate

NO₃^-

nitrite

NO₂^-

oxalate

C₂O₄^2-

peroxide

O₂^2-

phosphate

PO₄^3-

phosphite

PO₃^3-

sulfate

SO₄^2-

sulfite

SO₃^2-