Zn, Cd and Hg have very low melting points due to non involvement of $d^{10}$ configuration in metallic bonding.

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Detailed Solution

Transition metals have close-packed structures in which transition metals are held together by strong metallic bonds which have notable covalent character. For Zn, Cd and Hg the d orbitals are completely filled and no metallic bonds are formed.

Hence, transition metals have low melting and boiling points.

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