The number of d- electrons in Fe^{2+} (at. no | vedclass

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(D) The electronic configuration of $Fe$ $(Z=26)$ is $[Ar] 3d^6 4s^2$. For $Fe^{2+}$,the configuration is $[Ar] 3d^6$. Thus,the number of $d-$ electro

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$p-$ electrons in $Cl^{-}$ (at. no. of $Cl = 17$)

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(D) The electronic configuration of $Fe$ $(Z=26)$ is $[Ar] 3d^6 4s^2$. For $Fe^{2+}$,the configuration is $[Ar] 3d^6$. Thus,the number of $d-$ electrons is $6$. $(A)$ $Ne$ $(Z=10)$: $1s^2 2s^2 2p^6$. Number of $p-$ electrons $= 6$. $(B)$ $Mg$ $(Z=12)$: $1s^2 2s^2 2p^6 3s^2$. Number of $s-$ electrons $= 2+2+2 = 6$. $(C)$ $Fe$ $(Z=26)$: $[Ar] 3d^6 4s^2$. Number of $d-$ electrons $= 6$. $(D)$ $Cl^{-}$ $(Z=17)$: $1s^2 2s^2 2p^6 3s^2 3p^6$. Number of $p-$ electrons $= 6+6 = 12$. Since $6 
eq 12$,the number of $d-$ electrons in $Fe^{2+}$ is not equal to the number of $p-$ electrons in $Cl^{-}$.

The number of $d-$ electrons in $Fe^{2+}$ (at. no. of $Fe = 26$) is not equal to that of the

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