Polyatomic Ions

Chromate
CrO4 -2
Peroxide
O2 -2
Silicate
SiO3 -2
Oxalate
C2O4 -2
Carbonate
CO3 -2
Sulfite
SO3 -2
Sulfate
SO4 -2
Dichromate
Cr2O7 -2
Selenate
SeO4 -2
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