Chemistry - Common Polyatomic Ions

Cation

Cation

positively charged ion

Anion

negatively charged ion

NH4 +

ammonium

H3O +

hydronium

CH3COO -

acetate

C2H3O2 -

other acetate

CN -

cyanide

OH -

hydroxide

ClO -

hypochlorite

ClO2 -

chlorite

ClO3 -

chlorate

ClO4 -

perchlorate

NO2 -

nitrite

NO3 -

nitrate

MnO4 -

permanganate

CO3 -2

carbonate

HCO3 -

hydrogen carbonate (bicarbonate)

CrO4 -2

chromate

Cr2O7 -2

dichromate

O2 -2

peroxide

PO4 -3

phosphate

HPO4 -2

hydrogen phosphate

H2PO4 -

dihydrogen phosphate

SO3 -2

sulfite

SO4 -2

sulfate

HSO4 -

hydrogen sulfate (bisulfate)