PYQ NEET- Structure Of Atom L-10

Question: The number of d-electrons in $\mathrm{Fe}^{2+}(Z=26)$ is not equal to the number of electrons in which one of the following?#

A) d-electrons in $\mathrm{Fe}(\mathrm{Z}=26)$

B) p-electrons in $\mathrm{Ne}(\mathrm{Z}=10)$

C) s-electrons in $\mathrm{Mg}(\mathrm{Z}=12)$

D) p-electrons in $\mathrm{Cl}(\mathrm{Z}=17)$

Answer: p-electrons in $\mathrm{Cl}(\mathrm{Z}=17)$#

Solution:#

Number of d-electrons in $\mathrm{Fe}^{2+}=6$

Number of p-electrons in $\mathrm{Cl}=11$