\(Cu ^{++}=3 d ^{9}\)
No. of unpaired \(e ^{-}=1\)
\(M \cdot M=\sqrt{1(1+2)}=\sqrt{3}=1.73\,BM\)
(આપેલ : પરમાણુક્રમાંક $\mathrm{Sc}=21, \mathrm{Ti}_{\mathrm{i}}=22, \mathrm{~V}=23, \mathrm{Cr}=24, \mathrm{Mn}=25$ અને $\mathrm{Zn}=30$ )