A transition element should contain incomplete d-orbital to be considered as one. The atomic number of Cu is Z=29, ideally it should have an electronic configuration of 4s2 3d9. This ground state is hypothetical and is not observed in Cu, due to a more stable available configuration, is the electron from s-orbital is put in d-orbital it forms a completely filled which we know is stable. So, it attains a 3d10 configuration.
The orbital diagram can be considered as follows:
Electronic configuration = 4s1 3d10
So according to the definition of transition elements Cu2+ has an empty d-orbital and thus can exhibit the properties of a transition element.
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