What is the correct electronic configuration of the central atom in K
4
[Fe(CN)
6
] based on crystal field theory?
- At
2g
4
e
g
2
- Bt
2g
6
e
g
0
- Ce
3
t
2 - De
4
t
2
Solution & Step-by-step Explanation
In K
4
[Fe(CN)
6
], the central metal ion is Fe
2+
(3d
6
).
CN
−
is a strong field ligand, so the crystal field splitting energy (Δ
o
) is greater than the pairing energy.
Electrons pair up in the lower energy t
2g
orbitals before occupying e
g
.
All 6 electrons go into t
2g
.
Configuration: t
2g
6
e
g
0
.
4
[Fe(CN)
6
], the central metal ion is Fe
2+
(3d
6
).
CN
−
is a strong field ligand, so the crystal field splitting energy (Δ
o
) is greater than the pairing energy.
Electrons pair up in the lower energy t
2g
orbitals before occupying e
g
.
All 6 electrons go into t
2g
.
Configuration: t
2g
6
e
g
0
.