the number of d electrons in fe2

Question

The number of d  electrons in Fe⁺²   (atomic number of Fe= 26  ) is not equal to that of the:

(1) p-electrons in Ne   (At. No.= 10)  

(2) s-electrons in   (At. No.= 12) 

(3) d -electrons in Fe 

(4) p-electrons in Cl^-  (At. No. of     = 17)

Ans:  p-electrons in Cl^-  (At. No. of     = 17)