The number of unpaired electrons in Ni (atomi | vedclass

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(B) The atomic number of $Ni$ is $28$.Its electronic configuration is: $1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^8$.In the $3d$ subshell, there are $8$ electr

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$2$

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(B) The atomic number of $Ni$ is $28$.Its electronic configuration is: $1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^8$.In the $3d$ subshell, there are $8$ electrons.According to Hund's rule, these $8$ electrons are filled in the $5$ $d$-orbitals as follows:First, $5$ electrons are filled singly, and then the remaining $3$ electrons are paired.This results in $3$ paired orbitals and $2$ singly occupied (unpaired) orbitals.Therefore, the number of unpaired electrons in $Ni$ is $2$.

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

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