The valency of copper (Cu) in cupric chloride is

The chemical formula of cupric chloride is ${\mathrm{CuCl}}_2.$The element Cl belongs to VIIA group so that its valency is 1.

2(-1)+1(x)=0 and then x = +2

So, the oxidation state of Cu in ${\mathrm{CuCl}}_2 \mathrm{is} +2$

Therefore, the valency of copper (Cu) is 2