(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).