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(B) $Hg$ exhibits the lowest $M.P.$ and $B.P.$ among the given transition elements.This is because $Hg$ has a completely filled $d$-orbital $([Xe] 4f^

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$Hg$

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(B) $Hg$ exhibits the lowest $M.P.$ and $B.P.$ among the given transition elements.This is because $Hg$ has a completely filled $d$-orbital $([Xe] 4f^{14} 5d^{10} 6s^2)$,meaning there are no unpaired electrons available for metallic bonding.Consequently,the interatomic forces are very weak,making $Hg$ a liquid at room temperature with a melting point of $234 \ K$.

Among the following transition elements,the lowest $M.P.$ and $B.P.$ is exhibited by

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