Oxidation States for Common Polyatomic Ions

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Cations
Ion Name
Ag(NH3)2+ Diammine silver (I)
Hg22+ Mercury (I)
NH4+ Ammonium
Anions
Ion Name
AsO33- Arsenite
AsO43- Arsenate
BO33- Borate
C2H3O2- Acetate
CH3COO-
CN- Cyanide
CO32- Carbonate
HCO3- Hydrogen carbonate
C2O42- Oxalate
ClO- Hypochlorite
ClO2- Chlorite
ClO3- Chlorate
ClO4- Perchlorate
CrO42- Chromate
Cr2O72- Dichromate
Fe(CN)63- Hexacyanoferrate (III)
Fe(CN)64- Hexacyanoferrate (II)
MnO4- Permanganate
MnO42- Manganate
MoO42- Molybdate
NH2- Amide
NO2- Nitrite
NO3- Nitrate
O22- Peroxide
OH- Hydroxide
PO43- Phosphate
HPO42- Hydrogen phosphate
H2PO4- Dihydrogen phosphate
SCN- Thiocyanate
SO32- Sulfite
HSO3- Hydrogen sulfite
SO42- Sulfate
HSO4- Hydrogen sulfate
S2O32- Thiosulfate