Question

The electronic configuration of $F{e}_{26}$ is $[Ar]$:

• A. $3d^{8}4s^2$
• B. $3d^{7}4s^2$
• C. $3d^{6}4s^2$
• D. $3d^{5}4s^2$

Answer 1

Answer: (C)

Electrons are filled, in orbitals according to aufbau rule,
${}_{26}Fe=1s^2,2s^2,2p^6,3s^2,3p^6,4s^2,3d^6$