Polyatomic Ions


NameFormula
ammonium NH4+
nitrite NO2
nitrate NO3
sulfite SO32−
sulfate SO42−
hydrogen sulfate
(aka: bisulfate)
HSO4
thiosulfate S2O32−
oxalate C2O42−
hydroxide OH
NameFormula
phosphite PO33−
phosphate PO43−
hydrogen phosphate HPO42−
dihydrogen phosphate H2PO4
perchlorate ClO4
chlorate ClO3
chlorite ClO2
hypochlorite ClO
bromate BrO3
iodate IO3
NameFormula
acetate
acetate
CH3COO
C2H3O2
carbonate CO32−
hydrogen carbonate
(aka: bicarbonate)
HCO3
chromate CrO42−
dichromate Cr2O72−
permanganate MnO4
peroxide O22−
cyanide CN
cyanate OCN
thiocyanate SCN

Some Metallic Cations

IUPAC Nameolder nameFormula
copper(I)cuprous Cu+
copper(II)cupric Cu2+
iron(II)ferrous Fe2+
iron(III)ferric Fe3+
lead(II)plumbous Pb2+
lead(IV)plumbic Pb4+
mercury(I)mercurous Hg22+
mercury(II)mercuric Hg2+
tin(II)stannous Sn2+
tin(IV)stannic Sn4+