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

The number of d-electrons in Fe^(2+) (Z = 26) is not equal to the numb

1.	The number of d-electrons in Fe^(2+) (Z = 26) is not equal to the number of electrons in which one of the following ?
Answer» d-electrons in Fe (Z = 26) p-electrons in Ne (Z = 10) s-electrons in Mg (Z = 12) p-electrons in CL (Z = 17) Solution :`._(26)Fe = 1s^(2) 2s^(2) 2P^(6) 3s^(2) 3P^(6) 3d^(6) 4s^(2)` (d - electrons = 6) `Fe^(2+) = 1s^(2) 2s^(2) 2p^(6) 3s^(2) 3p^(6) 3d^(6)` (d-electrons = 6) `._(10)Ne = 1s^(2) 2s^(2) 2p^(6)` (p-electrons = 6) `._(12)Mg = 1s^(2) 2s^(2) 2p^(6) 3s^(2)` (s-electron `= 2 + 2 + 2 = 6`) `._(17)Cl = 1s^(2) 2s^(2) 2p^(6) 3s^(2) 3p^(5)` (p-electrons `= 6 + 5= 11`)