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(A) The boiling point of transition metals depends on the strength of metallic bonding,which is determined by the number of unpaired electrons in the

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$Zn$

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(A) The boiling point of transition metals depends on the strength of metallic bonding,which is determined by the number of unpaired electrons in the $d$-orbitals.$Zn$ has a completely filled $d$-orbital $(3d^{10} 4s^2)$,meaning it has no unpaired electrons available for metallic bonding.Consequently,$Zn$ exhibits the weakest metallic bonding among the given options,resulting in the lowest boiling point.

Which of the following transition metals has the lowest boiling point $(B.P.)$?

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