Chart: Common Polyatomic Ions

Common Polyatomic Ions

1-

2-

3-

1+

2+

acetate, CH 3 COO

carbonate, CO 3 2-

arsenate, AsO 3 3-

ammonium, NH 4 +

dimercury, Hg 2 2+

bromate, BrO 3

chromate, CrO 4 2-

phosphite, PO 3 3-

chlorate, ClO 3

dichromate, Cr 2 O 7 2-

phosphate, PO 4 3-

chlorite, ClO 2

hydrogen phosphate, HPO 4 2-

cyanide, CN

oxalate, C 2 O 4 2-

dihydrogen phosphate, H 2 PO 4

peroxide, O 2 2-

hydrogen carbonate, HCO 3

silicate, SiO 3 2-

hydrogen sulfate, HSO 4

sulfate, SO 4 2-

hydrogen sulfide, HS

sulfite, SO 3 2-

hydroxide, OH

hypochlorite, ClO

nitrate, NO 3

nitrite, NO 2

perchlorate, ClO 4

permanganate, MnO 4

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