Polyatomic Ions

Ammonium
NH4 (+1)
Hydronium
H30 (+1)
Mercury (I)
Hg2 (2+)
Dihydrogen Phosphite
H2PO3 (-1)
Dihydrogen Phosphate
H2PO4 (-1)
Hydrogen Carbonate
HCO3 (-1)
Hydrogen Sulfite
HSO3 (-1)
Hydrogen Sulfate
HSO4 (-1)
Nitrite
NO2 (-1)
Nitrate
NO3 (-1)
Hydroxide
OH (-1)
Acetate
CH3COO or C2H3O2 (-1)
Chromite
CrO2 (-1)
Cyanide
CN (-1)
Cyanate
CNO (-1)
Thiocyanate
CNS (-1)
Superoxide
O2 (-1)
Permanganate
MnO4 (-1)
Hypochlorite
ClO (-1)
Chlorite
ClO2 (-1)
Chlorate
ClO3 (-1)
Perchlorate
ClO4 (-1)
Hypobromite
BrO (-1)
Bromite
BrO2 (-1)
Bromate
BrO3 (-1)
Perbromate
BrO4 (-1)
Hypoiodite
IO (-1)
Iodite
IO2 (-1)
Iodate
IO3 (-1)
Periodate
IO4 (-1)
Aluminate
AlO2 (-1)
Azide
N3 (-1)
Hydrogen Phosphite
HPO3 (2-)
Hydrogen Phosphate
HPO4 (2-)
Carbonate
CO3 (2-)
Sulfite
SO3 (2-) 
Sulfate
SO4 (2-)
Thiosulfate
S2O3 (2-)
Silicate
SiO3 (2-)
Carbide
C2 (2-)
Oxalate
C2O4 (2-)
Chromate
CrO4 (2-)
Dichromate
Cr2O7 (2-) 
Tartrate
C4H4O6 (2-)
Molybdate
MoO4 (2-)
Perioxide
O2 (2-)
Disulfide
S2 (2-)
Phosphite
PO3 (3-)
Phosphate
PO4 (-3)
Hypophosphite
PO2 (3-)
Arsenite
AsO3 (3-)
Arsenate
AsO4 (3-)
Pyrophosphate
P2O7 (4-)
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