Complete List of Polyatomic Ions

Nitrate

Nitrate

NO3
Charge -1

Nitrite

NO2
Charge -1

Sulfate

SO4
Charge -2

Sulfite

SO3
Charge -2

Ammonium

NH4
Charge +1

Hydroxide

OH
Charge -1

Acetate

C2H3O2
Charge -1

Carbonate

CO3
Charge -2

Chromate

CrO4
Charge -2

Phosphate

PO4
Charge -3

Phosphite

PO3
Charge -3

Chlorate

ClO3
Charge -1

Chlorite

ClO2
Charge -1

Cyanide

CN
Charge -1

Hydrogen Carbonate (Bicarbonate)

HCO3
Charge -1

Hypochlorite

ClO
Charge -1

Perchlorate

ClO4
Charge -1

Dichromate

Cr2O7
Charge -2

Permanganate

MnO4
Charge -1

Oxalate

C2O4

Charge -2

Hydronium

H3O
Charge +1

Peroxide

O2
Charge -2