what would the valency of the following radicles:
MnO4
,CrO4,
AlO2
,PbO2,
ClO,
SiO
3,ZnO2
In MnO4- Mn has a +7 valency.
In CrO42- Cr has a +6 valency.
In SiO Si has a +2 valency.
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