Zn, Cd, Hg have lowest melting points in their respective periods. This can be explained based on

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defects is crystal structures

charges present in nucleus

conducting properties

electrons used for bonding

answer is A.

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Detailed Solution

When one or more unpaired electrons are present, metallic bond is formed. Increase in unpaired electron makes the metallic bond stronger.

Electronic Configuration of zinc(30) = [AR]3d¹⁰4s²

Electronic configuration of Cadmium(48)= [Kr]4d¹⁰5s²

Electronic configuration of Mercury= [Xe]4f¹⁴5d¹⁰6s²

Now strong metallic bond is not possible because unpaired electrons are absent.

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