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27 Polyatomic Ions

ammonium NH + 4
nitrite NO 2
nitrate NO - 3
hydrogen sulfate HSO 4
hydroxide OH-
cyanide CN-
permanganate MnO - 4
hydrogen carbonate HCO - 3
hypochlorite CIO-
chlorite CIO - 2
chlorate CIO - 3
perchlorate CIO - 4
bromate BrO - 3
iodate IO - 3
periodate IO - 4
acetate C H O - 2 3 2
dihydrogen phosphate H PO - 2 4
carbonate CO 2- 3
sulfite SO 2- 3
sulfate SO 2- 4
thiosulfate S O 2- 2 3
peroxide O 2- 2
chromate CrO 2- 4
dichromate Cr O 2- 2 7
hydrogen phosphate HPO 2- 4
phosphate PO 3- 4
arsenate AsO 3- 4