polyatomic ions

ammonium

ammonium

NH4+

acetate

C2H3O2-

chlorate

ClO3-

chlorite

ClO2-

cyanide

CN-

permanganate

MnO4-

hydrogen carbonate (bicarbonate)

HCO3-

hydroxide

OH-

hypochlorite

ClO 1-

nitrate

NO3-

nitrite

NO2-

carbonate

CO3 2-

chromate

CrO4 2-

sulfate

SO4 2-

sulfite

SO3 2-

phosphate

PO4 3-