Question

What is the correct electronic configuration of the central atom in $K_4[Fe(CN)_6)$ based on crystal field theory ?

• A. $e^3\,t^3_2$
• B. $e^4\,t^2_2$
• C. $t_{2g}^4\,e^2_g$
• D. $t_{2g}^6\,e^0_g$

Answer 1

Answer: (D)

$K_4[Fe(CN)_6]$
Fe ground state: $[Ar]3d^6 4s^2$
$Fe^{2+} : 3d^6 4s^0$