All Polyatomic Ions to Know

$$CO_3^{2-}$$

Carbonate

$$HCO_3^{-}$$

Hydrogen carbonate or bicarbonate

$$CH_3COO^{-}$$

Acetate

$$CN^{-}$$

Cyanide

$$SCN^{-}$$

Thiocyanate

$$ClO^{-}$$

Hypochlorite

$$ClO_2^{-}$$

Chlorite

$$ClO_3^{-}$$

Chlorate

$$ClO_4^{-}$$

Perchlorate

$$CrO_4^{2-}$$

Chromate

Cr₂O₇^2-

Dichromate

$$MnO_4^{-}$$

Permanganate

$$N_3^{-}$$

Azide

$$NH_4^{+}$$

Ammonium

$$NO_2^{-}$$

Nitrite

$$NO_3^{-}$$

Nitrate

$$OH^{-}$$

Hydroxide

$$O_2^{2-}$$

Peroxide

$$PO_4^{3-}$$

Phosphate

$$HPO_4^{2-}$$

Hydrogen phosphate

H₂PO₄^-

Dihydrogen phosphate

$$S_2^{2-}$$

Disulfide

$$SO_3^{2-}$$

Sulfite

$$SO_4^{2-}$$

Sulfate

$$HSO_3^{-}$$

Hydrogen sulfite or bisulfite

$$HSO_4^{-}$$

Hydrogen sulfate or bisulfate