S^-2

(a)  

O₂^-2

(a)  

CO₃^-2

(a)  

C₂O₄^-2

(a)  

MnO₄^-2

(a)  

MoO₄^-2

(a)  

ZnO₂^-2

(a)  

PbO₂^-2

(a)  

SnO₂^-2

(a)  

SnO₃^-2

(a)  

CrO₄^-2

(a)  

Cr₂O₇^-2

(a)  

SO₃^-2

(a)  

SO₄^-2

(a)  

S₂O₃^-2

(a)  

S₄O₈^-2

(a)  

S₂O₇^-2

(a)  

S₄O₆^-2

(a)  

B₄O₇^-2

(a)  

SiO₃^-2

(a)  

HPO₃^-2

(a)  

HPO₄^-2

(a)  

HAsO₃^-2

(a)  

HAsO₄^-2

(a)