Common Polyatomic Ions

A collection of chemical names and formulas for common cations and anions, including singly, doubly, and triply charged ions.

Ammonium

$$NH_4^+$$

Nitrite

$$NO_2^-$$

Nitrate

$$NO_3^-$$

Acetate

$$CH_3CO_2^-$$

Cyanide

$$CN^-$$

Hypochlorite

$$ClO^-$$

Chlorite

$$ClO_2^-$$

Chlorate

$$ClO_3^-$$

Perchlorate

$$ClO_4^-$$

Dihydrogen phosphate

$$H_2PO_4^-$$

Hydrogen carbonate (or bicarbonate)

$$HCO_3^-$$

Hydrogen sulfate (or bisulfate)

$$HSO_4^-$$

Hydroxide

$$OH^-$$

Permanganate

$$MnO_4^-$$

Carbonate

$$CO_3^{2-}$$

Chromate

$$CrO_4^{2-}$$

Dichromate

$$Cr_2O_7^{2-}$$

Peroxide

$$O_2^{2-}$$

Hydrogen phosphate

$$HPO_4^{2-}$$

Sulfite

$$SO_3^{2-}$$

Sulfate

$$SO_4^{2-}$$

Thiosulfate

$$S_2O_3^{2-}$$

Phosphate

$$PO_4^{3-}$$