Polyatomic Ions

Hydronium
H3O+
Mercury (I)
Hg22+
Ammonium
NH4+
Acetate

C2H3O2

or

 CH3COO

Cyanide
CN
Carbonate
CO32-
Hydrogen Carbonate
HCO3
Oxalate
C2O42
Hypochlorite
ClO
Chlorite
ClO2
Chlorate
ClO3
Perchlorate
ClO4
Chromate
CrO42-
Dichromate
Cr2O7-2
Permanganate
MnO4
Nitrite
NO2
Nitrate
NO3
Peroxide
O22-
Hydroxide
OH
Phosphate
PO43-
Sulfite
SO32-
Sulfate
SO42-
Hydrogen Sulfate
HSO4
Thiocyanate
SCN
Thiosulfate
S2O32-
x

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