The number of unpaired electrons in Ni (atomic number $=28$ ) are

The number of unpaired electrons in $\mathrm{Ni}$ (atomic number $=28$ ) are 2 . It can be easily concluded from the electronic configuration of $\mathrm{kL}$. Electronic configuration of $$ \mathrm{Ni}=\mathrm{l} s^{2} 2 \mathrm{s}^{2} 2 p^{6} 3 \mathrm{s}^{2} 3 p^{6} 4 \mathrm{s}^{2} \mathrm{W}^{8} $$ Orbitals of $\mathrm{Ni}$ in $3 d=$