Polyatomic Ion

Formula

Ammonium

(NH₄)⁺¹

Nitrite

(NO₂)^-1

Nitrate

(NO₃)^-1

Hydroxide

(OH)^-1

Cyanide

(CN)^-1

Permanganate

(MnO₄)^-1

*Hypochlorite

(ClO)^-1

*Chlorite

(ClO₂)^-1

*Chlorate

(ClO₃)^-1

*Perchlorate

(ClO₄)^-1

Bromate

(BrO₃)^-1

Iodate

(IO₃)^-1

Acetate

(CH₃COO)^-1 or (C₂H₃O₂)^-1

Hydrogen Carbonate (Bicarbonate)

(HCO₃)^-1

Hydrogen Sulfate (Bisulfate)

(HSO₄)^-1

Carbonate

(CO₃)^-2

Sulfite

(SO₃)^-2

Sulfate

(SO₄)^-2

Thiosulfate

(S₂O₃)^-2

Peroxide

(O₂)^-2

Chromate

(CrO₄)^-2

Dichromate

(Cr₂O₇)^-2

Phosphite

(PO₃)^-3

Phosphate

(PO₄)^-3