The metallic bond strength in first transition series increases from:
• A
$Sc$ to $Mn$
• B
$Sc$ to $Cr$
• C
$Cr$ to $Zn$
• D
$Sc$ to $Cu$

#### Solution

The increase in the no. of unpaired electrons increases the strength of the metallic bond in transition elements.
$\Rightarrow \ Sc$ to $Mn$