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The number of d-electrons in $Fe^{2+}$ (Z = 26) is not equal to the number of electrons in which one of the following?
A
s-electrons in Mg (Z = 12)
B
p-electrons in Cl (Z = 17)
C
d-electrons in Fe (Z = 26)
D
p-electrons in Ne (Z = 10)
Detailed Solution
$Fe^{2+}$: $[Ar]3d^6$, so 6 d-electrons.
Mg: $1s^22s^22p^63s^2$ — 6 s-electrons.
Cl: $1s^22s^22p^63s^23p^5$ — 11 p-electrons.
Fe: $[Ar]3d^64s^2$ — 6 d-electrons.
Ne: $1s^22s^22p^6$ — 6 p-electrons.
So the p-electrons in Cl (11) are not equal to the d-electrons in $Fe^{2+}$.
Mg: $1s^22s^22p^63s^2$ — 6 s-electrons.
Cl: $1s^22s^22p^63s^23p^5$ — 11 p-electrons.
Fe: $[Ar]3d^64s^2$ — 6 d-electrons.
Ne: $1s^22s^22p^6$ — 6 p-electrons.
So the p-electrons in Cl (11) are not equal to the d-electrons in $Fe^{2+}$.