IGNOU MCH 11 2026 2027 - Give the octahedral as well as tetrahedral field electronic configurat

Question

Give the octahedral as well as tetrahedral field electronic configuration for the Cr3+ and Mn2+
ions. Which site will be preferred by these ions, octahedral or tetrahedral? Justify your answer.

17 Jul 2026

Answer :

Word Count : 278

Cr³⁺ has the electronic configuration ([Ar],3d^3). In an octahedral crystal field, the five d-orbitals split into three lower-energy (t_{2g}) orbitals and two higher-energy (e_g) orbitals. The three electrons occupy the lower (t_{2g}) orbitals singly according to Hund's rule, giving the configuration (t_{2g}^3e_g^0). In a tetrahedral crystal field, the splitting is reversed, with the lower (e) orbitals and higher (t_2) orbitals. The three electrons are distributed as (e^2t_2^1).

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