(આપેલ પરમાણુ ક્રમાંક : $Sc : 21, Тi : 22, V : 23, Cr : 24, Mn : 25, Fe : 26, Co : 27,$ $\mathrm{Ni}: 28, \mathrm{Cu}: 29, \mathrm{Zn}: 30)$
$\mathrm{V}_2 \mathrm{O}_5$
Here ' $\mathrm{V}$ ' is in $+5$ oxidation state
$\mathrm{V}^{-5} \Rightarrow 1 \mathrm{~s}^2 2 \mathrm{~s}^2 2 \mathrm{p}^6 3 \mathrm{~s}^2 3 \mathrm{p}^6 \text { (no unpaired electrons) }$