Common Polyatomic Ions

ordered according to charge and ion family

+1 CHARGE -1 CHARGE -2 CHARGE -3 CHARGE -4 CHARGE
ion name ion name ion name ion name ion name
NH4+ ammonium H2PO3- dihydrogen phosphite HPO32- hydrogen phosphite PO33- phosphite P2O74- pyrophosphate


H2PO4- dihydrogen phosphate HPO42- hydrogen phosphate PO43- phosphate



HCO3- hydrogen carbonate CO32- carbonate PO23- hypophosphite



HSO3- hydrogen sulfite SO32- sulfite AsO33- arsenite



HSO4- hydrogen sulfate SO42- sulfate AsO43- arsenate



NO2- nitrite S2O32- thiosulfate





NO3- nitrate SiO32- silicate





OH- hydroxide C22- carbide





CH3COO- acetate C2O42- oxalate





CrO2- chromite CrO42- chromate





CN- cyanide Cr2O72- dichromate





CNO- cyanate C4H4O62- tartrate





CNS- thiocyanate MoO42- molybdate





MnO4- permanganate







ClO- hypochlorite







ClO2- chlorite







ClO3- chlorate







ClO4- perchlorate







BrO- hypobromite







BrO2- bromite







BrO3- bromate







BrO4- perbromate







IO- hypoiodite







IO2- iodite







IO3- iodate







IO4- periodate







AlO2- aluminate