Chem poly atomic ions

Ammonium ion

$$NH_4^+$$

Nitrate ion

$$NO_3^-$$

Hydronium ion

$$H_3O^+$$

Nitrite ion

$$NO_2^-$$

Peroxide ion

$$O_2^{2-}$$

Sulfate ion

$$SO_4^{2-}$$

Hydroxide ion

$$OH^-$$

Hydrogen sulfate ion

$$HSO_4^-$$

Acetate ion

$$CH_3COO^-$$

Sulfite ion

$$SO_3^{2-}$$

Cyanide ion

$$CN^-$$

Hydrogen sulfite ion

$$HSO_3^-$$

Azide ion

$$N_3^-$$

Phosphate ion

$$PO_4^{3-}$$

Carbonate ion

$$CO_3^{2-}$$

Hydrogen phosphate ion

$$HPO_4^{2-}$$

Bicarbonate ion

$$HCO_3^-$$

Dihydrogen phosphate ion

$$H_2PO_4^-$$

Perchlorate ion

$$ClO_4^-$$

Chlorate ion

$$ClO_3^-$$

Chlorite ion

$$ClO_2^-$$

Hypochlorite ion

$$ClO^-$$

Chromate ion

$$CrO_4^{2-}$$

Dichromate ion

$$Cr_2O_7^{2-}$$

Permanganate ion

$$MnO_4^-$$