How many unpaired electrons can be predicted for an iron(II) complex when the complex is tetrahedral?
A) 1
B) 2
C) 3
D) 4
E) 5

Question

Quizplus · Accepted Answer

In a tetrahedral complex, the crystal field splitting is less pronounced than in an octahedral complex. For an iron(II) ion (Fe^2+), which has a d^6 configuration, this means that all five d orbitals are relatively close in energy. As a result, the electrons will fill the orbitals in such a way to minimize repulsion, leading to four unpaired electrons.

How Many Unpaired Electrons Can Be Predicted for an Iron(II)