What is the oxidation number of copper?

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Solution

The oxidation number of copper depends on its state.
The oxidation number of metallic copper is zero.
In its compounds the most common oxidation number of Cu is +2. Less common is +1. Copper can also have oxidation number of +3 and +4.
$O N = + 2$ Examples are $C u C l_{2}, C u O$ and $C u S O_{4}$
$O N = + 1$ example are $C u C l, C u_{2} O$ and $C u_{2} S$
$O n = + 3$ examples are $K C U O_{2}$ and $K_{3} C u F_{6}$
$O N = + 4$ an example is $C s_{2} C u F_{6}$

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