How many unpaired electrons are there in Ni^{ | vedclass

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(A) The atomic number of $Ni$ is $28$. The electronic configuration of $Ni$ is $[Ar] 3d^8 4s^2$.When $Ni$ forms $Ni^{2+}$ ion,it loses two electrons f

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$2$

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(A) The atomic number of $Ni$ is $28$. The electronic configuration of $Ni$ is $[Ar] 3d^8 4s^2$.When $Ni$ forms $Ni^{2+}$ ion,it loses two electrons from the $4s$ orbital.The electronic configuration of $Ni^{2+}$ is $[Ar] 3d^8$.In the $3d$ subshell,there are $5$ orbitals. According to Hund's rule,filling $8$ electrons results in $3$ paired electrons and $2$ unpaired electrons.Therefore,the number of unpaired electrons in $Ni^{2+}$ is $2$.

How many unpaired electrons are there in $Ni^{2+}$?

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