Polyatomic Ions

nitrite ion
NO2
nitrate ion
NO3
chromate ion
CrO42-
dichromate ion
Cr2O72-
sulfite ion
SO32-
sulfate ion
SO42-

hydrogen sulfate ion

(bisulfate ion)

HSO4
thiosulfate
S2O32-
hypochlorite ion
ClO
chlorite ion
ClO2
chlorate ion
ClO3
perchlorate ion
ClO4
phosphate ion
PO43-
hydrogen phosphate ion
HPO42-
cyanide ion
CN
thiocyanate ion
SCN
carbonate ion
CO32-

hydrogen carbonate ion

(bicarbonate ion)

HCO3
oxalate ion
Cr2O42-
permanganate ion
MnO4
hydroxide ion
OH
acetate ion

C2H3O2

or

CH3CO2

ammonium ion

NH4+

dihydrogen phosphate ion
H2PO4
x

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