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Polyatomic Ions

Acetate Ion CH3COO-
Bromate Ion BrO3-
Chlorate Ion ClO3-
Chlorite Ion ClO2-
Cyanide Ion CN-
Dihydrogen Phosphate Ion H2PO4-
Hydrogen Carbonate (Bicarbonate) Ion HCO3-
Hydrogen Sulfate Ion HSO4-
Hydroxide Ion OH-
Hypochlorite Ion ClO-
Nitrate Ion NO3-
Nitrite Ion NO2-
Perchlorate Ion ClO4-
Permanganate Ion MnO4-
Carbonate Ion CO3 2-
Chromate Ion CrO4 2-
Dichromate Ion Cr2O7 2-
Hydrogen Phosphate Ion HPO4 2-
Oxalate Ion C2O4 2-
Peroxide Ion O2 2-
Sulfate Ion SO4 2-
Sulfite Ion SO3 2-
Arsenate Ion AsO4 3-
Phosphate Ion PO4 3-
Phosphite Ion PO3 3-
Ammonium Ion NH4+
Dimercury Ion Hg2 2+