Thenumber of d-electrons in Fe^(2+)(Z= 26)is notequal to thenumber of theelectronsin whichone ofthe following?

Thenumber of d-electrons in Fe^(2+)(Z= 26)is notequal to thenumber of

1.	Thenumber of d-electrons in Fe^(2+)(Z= 26)is notequal to thenumber of theelectronsin whichone ofthe following?
Answer» d- ELECTRONSIN Fe (Z= 26) p- electronsin Ne(Z = 10 ) s-electrons in Mg (Z= 12 ) p -electrons inC1 (Z =17) Solution :(a) E.C of Fe (Z=26) `= 1S^(2) 2S^(2)2p^(6)3s^(2)3p^(6)3D^(6)4s^(2)` `:. `E.C. of `Fe^(2+)= 1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)3d^(6)` Ithas sixp- electrons. ( c) E.C. of Mg (Z=12)= `1s^(2)2s^(2)2p^(6)3s^(2)` It haseleven( 6+5)p-electrons . NowC1 haseleven p-elements but `Fe^(2+)` has six d- electrons. Thereforeoption (d)iscorrect.