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  4. In which of the following metallic bond is strongest?

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Q. In which of the following metallic bond is strongest?

AFMCAFMC 2007

Solution:

Strength of metallic bonds depends upon number of unpaired electrons. As number of unpaired electrons increases, the bond strength increases. So $Cr , Mo , W$ show stronger bonding due to maximum number of unpaired electrons.
(a) $Fe =3 d^{6} 4 s^{2}=4$ unpaired electrons
(b) $Sc =3 d^{1} 4 s^{2}=1$ unpaired electron
(c) $V=3 d^{3} 4 s^{2}=3$ unpaired electrons
(d) $Cr =3 d^{5} 4 s^{1}=6$ unpaired electrons
Hence, $Cr$ has six unpaired electrons so, it is strongest metallic.