Some Common Polyatomic Ions

CHE-111

Acetate

CH₃COO^-

Carbonate

CO₃ ^2-

Hydrogen carbonate or bicarbonate

HCO₃ ^-

Cyanide

CN^-

Hypochlorite

CIO^-

Chlorite

CIO₂ ^-

Chlorate

CIO₃ ^-

Perchlorate

CIO₄ ^-

Dichromate

Cr₂ O₇ ^2-

Chromate

CrO₄ ^2-

Permanganate

MnO₄ ^-

Azide

N₃ ^-

Ammonium

NH₄ ⁺

Nitrite

NO₂ ^-

Nitrate

NO₃ ^-

Hydroxide

OH^-

Peroxide

O₂ ^2-

Phosphate

PO₄ ^3-

Hydrogen phosphate

HPO₄ ^2-

Dihydrogen phosphate

H₂ PO₄ ^-

Disulfide

S₂ ^2-

Sulfate

SO₄ ^2-

Hydrogen sulfate or bisulfate

HSO₄ ^-

Sulfite

SO₃ ^2-

Hydrogen Sulfite or bisulfite

HSO₃ ^-

Thiocyanate

SCN^-