Polyatomic Cations NH4+ ammonium ion H3O+ hydronium ion Polyatomic Anions |
-1 CH3COO- or C2H3O2- acetate ion CHO2- formate ion ClO- hypochlorite ion ClO2- chlorite ion ClO3- chlorate ion ClO4- perchlorate ion CN- cyanide ion HCO3- hydrogen carbonate ion or bicarbonate ion HSO3- hydrogen sulfite ion or bisulfite ion HSO4- hydrogen sulfate ion or bisulfate ion H2PO4- dihydrogen phosphate ion MnO4- permanganate ion NO2- nitrite ion NO3- nitrate ion OH- hydroxide ion |
-2 CO32- carbonate ion C2O42- oxalate ion CrO42- chromate ion Cr2O72- dichromate ion HPO42- hydrogen phosphate ion O22- peroxide ion SiO32- silicate ion SO32- sulfite ion SO42- sulfate ion S2O32- thiosulfate ion |
-3 AsO43- arsenate ion BO33- borate ion PO33- phosphite ion PO43- phosphate ion |
Chromium Cr2+, Cr3+ Cobalt Co2+, Co3+ Copper Cu+, Cu2+ Iron Fe2+, Fe3+ Lead Pb2+, Pb4+ Manganese Mn2+, Mn3+, Mn4+ Mercury Hg22+ mercury(I) and Hg2+ mercury(II) Tin Sn2+, Sn4+ Careful with this one! Mercury: Hg22+ (mercury I) and Hg2+ (mercury II) |