The number of d-electrons in `Fe^(2+)`(Z=26) is not equal to the number of electrons in which one of the following ?

Options

A. p-electrons in Cl (Z = 17)
B. d-electrons in Fe (Z = 26)
C. p-electrons in Ne (Z = 10)
D. s-electrons in Mg (Z = 12)

Answer

A

Explanation

`Fe^(+2)=3d^(6)4s^(0)` six d-electrons, p-electrons in chlorine `(1s^(2)2s^(2)2p^(6)3s^(2)3p^(5))` are = 11
as p-electrons = 6 + 5 = 11.