In the first transition series,the metallic b | vedclass

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(B) The strength of metallic bonding is directly proportional to the number of unpaired electrons in the $d$-orbitals. In the first transition series

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$Sc$ to $Cr$

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(B) The strength of metallic bonding is directly proportional to the number of unpaired electrons in the $d$-orbitals. In the first transition series ($3d$-series),the number of unpaired electrons increases from $Sc$ ($3d^1 4s^2$,$1$ unpaired electron) to $Cr$ ($3d^5 4s^1$,$6$ unpaired electrons). Therefore,the metallic bond strength increases from $Sc$ to $Cr$.

In the first transition series,the metallic bond strength increases from ..... to .....

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