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  4. The ions of metals of group-12 (Zn, Cd and Hg) have a complete d -shell, and so

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Q. The ions of metals of group-$12 (Zn, Cd$ and $Hg)$ have a complete $d$ -shell, and so

The d-and f-Block Elements

Solution:

Typical transition metals have partially filled $d$ -orbital either in their elemental state or in most common oxidation state, but ions of metals of group-$12 (Zn, Cd$ and $Hg)$ have a completely filled $d$ -subshell and so they do not behave like transition metals.