CO₃ ²⁻
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carbonate
C₂O₄ ²⁻
oxalate
CrO₄ ²⁻
chromate
Cr₂O₇ ²⁻
dichromate
HPO₄ ²⁻
hydrogen phosphate
O₂ ²⁻
peroxide
SO₄ ²⁻
sulfate
SO₃ ²⁻
sulfite
S₂O₃ ²⁻
thiosulfate
PO₄ ³⁻
phosphate
PO₃ ³⁻
phosphite