Polyatomic Ions

Ammonium

NH4+

Hydronium

H3O+

Acetate

HCO3-

Perchlorate

ClO4-

Chlorate

ClO3-

Chlorite

ClO2-

Hypochlorite

ClO-

Cyanide

CN-

Dihydrogen Phosphate

H2PO4-

Hydroxide

OH-

Nitrate

NO3-

Nitrite

NO2-

Chromate

CrO4 2-

Carbonate

CO3 2-

Dichromate

Cr2O7 2-

Peroxide

O2 2-

Oxalate

Sulfate

SO4 2-

Sulfite

SO3 2-

Thiosulfate

S2O3 2-

Phosphate

PO4 3-

Phosphite

PO3 3-