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

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

WBJEEWBJEE 2018The d-and f-Block Elements

Solution:

The number of unpaired electrons in $Ni$ (atomic number $=28)$ are $2$. It can be easily concluded from the electronic configuration of $Ni$. Electronic configuration of $Ni =1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{2} 3 d^{8}$

Orbitals of $Ni$ in $3d$ = image