Polyatomic Ions

Mercury (I): Hg_2^2+

Ammonium: NH_4^+

Nitrite: NO_2^-

Nitrate: NO_3^-

Sulfite: SO_3^2-

Sulfate: SO_4^2-

Hydrogen sulfate: HSO_4^-

Hydroxide: OH^-

Cyanide: CN^-

Phosphate: PO_4^3-

Hydrogen phosphate: HPO_4^2-

Dihydrogen Phosphate: H_2PO_4^-

Thiocyanate: SCN^-

Carbonate: CO_3^2-

Hydrogen Carbonate: HCO_3^-