Here's why:

* Metallic bonding is a type of chemical bonding that occurs between metal atoms. It involves the sharing of delocalized electrons (electrons that are not bound to any particular atom) in a "sea" of electrons. This allows for good electrical and thermal conductivity, malleability, and ductility in metals.

* Copper is a metal and exhibits metallic bonding.

* Chlorine is a non-metal and forms covalent bonds. Covalent bonds involve the sharing of electrons between two atoms.

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