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The valency of Cu in CuO is 2
1 5 1
The valency of Cu in CuO is 2 and Cu2O is 1.
1 5 1
The Its Valency is 2 in CuO
the formula being CuO

The copper donates two electrons to the oxygen and forms one ionic bond.
whereas in Cu2O the valency is 1.
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