Question

Electronic configuration of $F{e}^{+2}$ is:

• A. $[Ar]4s^{2}3d^6$
• B. $[Ar]3d^6$
• C. $[Ar]4s^{2}3d^4$
• D. $[Ar]4s^{2}3d^0$

Answer 1

Answer: (B)

Fe $($ atomic number $=26)$
$=1s^2,2s^{2}2p^6,3s^{2}3p^{6}3d^6,4s^2$
$F{e}^{+2}=1s^2,2s^{2}2p^6,3s^{2}3p^{6}3d^6$
$=[Ar]3d^6$