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(A) The atomic number of nickel $(Ni)$ is $28$.The electronic configuration of $Ni$ in its ground state is $[Ar] \ 3d^8 \ 4s^2$.In the $3d$ subshell,t

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$2$

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(A) The atomic number of nickel $(Ni)$ is $28$.The electronic configuration of $Ni$ in its ground state is $[Ar] \ 3d^8 \ 4s^2$.In the $3d$ subshell,there are $8$ electrons. According to Hund's rule,these are filled as follows: $5$ electrons occupy the orbitals singly,and the remaining $3$ electrons pair up,leaving $2$ unpaired electrons.The $4s$ subshell is completely filled with $2$ electrons,so there are no unpaired electrons in the $4s$ orbital.Therefore,the total number of unpaired electrons in the ground state of a nickel atom is $2$.

The number of unpaired electrons in the ground state of a nickel atom is $(Atomic \ number \ of \ Ni = 28)$.

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