(આપેલ : પરમાણુક્રમાંક $\mathrm{Sc}=21, \mathrm{Ti}_{\mathrm{i}}=22, \mathrm{~V}=23, \mathrm{Cr}=24, \mathrm{Mn}=25$ અને $\mathrm{Zn}=30$ )
$\mathrm{Cr}, \mathrm{Mn} \& \mathrm{Zn}$ is $\mathrm{Cr}$.
Spin only magnetic moment of $\mathrm{CrO}_4{ }^{2-}$.
Here $\mathrm{Cr}^{+0}$ is in $\mathrm{d}^0$ configuration (diamagnetic).