Polyatomic Compounds

NO2(-)
Nitrite
NO3(-)
Nitrate
NH4(+)
Ammonium
PO3(-3)
Phosphite
PO4(-3)
Phosphate
SO3(-2)
Sulfite
SO4(-2)
Sulfate
CO3(-2)
Carbonate
HCO3(-)
Hydrogen Carbonate (or Bicarbonate)
CN(-)
Cyanide
HCOO(-)
Formate
H3C2O2(-)
Acetate
C2O4(-2)
Oxalate
O2(-2)
Peroxide
OH(-)
Hydroxide
ClO3(-)
Chlorate
MnO4(-)
Permanganate
CrO4(-2)
Chromate
AsO4(-3)
Arsenate
SiO4(-4)
Silicate
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