How many unpaired electrons will Co have in the complex [CoCl₄]^2-? A)1 B)3 C)4 D)5

Question

Quizplus · Accepted Answer

The complex [CoCl4]2- has Co in a +2 oxidation state, meaning it loses 2 electrons from its [Ar]3d^7 4s^2 configuration, resulting in a [Ar]3d^7 configuration. In a tetrahedral complex, the crystal field splitting does not lead to pairing of the d electrons as it would in an octahedral complex. Therefore, Co^2+ in this complex will have 3 unpaired electrons.

How Many Unpaired Electrons Will Co Have in the Complex