Mercury is a liquid metal because .....

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(A) Mercury $(Hg)$ has the electronic configuration $[Xe] 4f^{14} 5d^{10} 6s^2$. Because the $5d$ subshell is completely filled,the electrons are held

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Its $d$-orbital is completely filled,so $d-d$ transition is not possible.

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(A) Mercury $(Hg)$ has the electronic configuration $[Xe] 4f^{14} 5d^{10} 6s^2$. Because the $5d$ subshell is completely filled,the electrons are held very strongly by the nucleus and are not available for metallic bonding. Consequently,the metallic bonding in mercury is very weak,which results in a low melting point,making it a liquid at room temperature. Also,due to the filled $d$-orbital,$d-d$ transitions are not possible.

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