Which of the following has the maximum number | vedclass

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(B) To find the number of unpaired $d-$ electrons,we look at the electronic configuration of each ion:$Zn$ $(Z=30)$: $[Ar] 3d^{10} 4s^2$ ($0$ unpaired

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$Fe^{2+}$

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(B) To find the number of unpaired $d-$ electrons,we look at the electronic configuration of each ion:$Zn$ $(Z=30)$: $[Ar] 3d^{10} 4s^2$ ($0$ unpaired electrons).$Fe^{2+}$ $(Z=26)$: $[Ar] 3d^6 4s^0$. In $3d^6$,the electrons are filled as: $\uparrow\downarrow, \uparrow, \uparrow, \uparrow, \uparrow$. This results in $4$ unpaired electrons.$Ni^{3+}$ $(Z=28)$: $[Ar] 3d^7 4s^0$. In $3d^7$,the electrons are filled as: $\uparrow\downarrow, \uparrow\downarrow, \uparrow, \uparrow, \uparrow$. This results in $3$ unpaired electrons.$Cu^{+}$ $(Z=29)$: $[Ar] 3d^{10} 4s^0$ ($0$ unpaired electrons).Therefore,$Fe^{2+}$ has the maximum number of unpaired $d-$ electrons.

Which of the following has the maximum number of unpaired $d-$ electrons?

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