Polyatomic Ions

Ammonium: NH4+

Acetate: C2H3O2-

Nitrite: NO2-

Nitrate: NO3-

Cyanide: CN-

Hydroxide: OH-

Chlorite: ClO2-

Chlorate: ClO3-

Perchlorate: ClO4-

oxalate: C2O4 2-

sulfite: SO3 2-

sulfate: SO4 2-

carbonate: CO3 2-

silicate: SiO3 2-

Peroxide: O2 2-

phosphite: PO3 3-

phosphate: PO4 3-

Hypochlorite: ClO-