polyatomic ions

ammonium

ammonium

NH4+

acetate

CH3COO-

perchlorate

CIO4-

chlorate

CIO3-

chlorite

CIO2-

hypochlorite

CIO-

cyanide

CN-

hydrogen carbonate (bicarbonate)

HCO3-

dihydrogen phosphate

H2PO4-

hydrogen sulfate (bisulfate)

HSO4-

permanganate

MnO4-

nitrate

NO3-

nitrite

NO2-

hydroxide

OH-

thiocyanate

SCN-

carbonate

CO3 2-

oxalate

C2O4 2-

chromate

CrO4 2-

dichromate

Cr2O7 2-

hydrogen phosphate

HPO4 2-

peroxide

O2 2-

sulfate

SO4 2-

sulfite

SO3 2-

thiosulfate

S2O3 2-

phosphate

PO4 3-

phosphite

PO3 3-