Word Count : 498

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The crystal field electronic configurations of Cr³⁺ and Mn²⁺ can be understood from their d-electron configurations and the splitting of d-orbitals in octahedral and tetrahedral ligand fields. In both cases, Cr³⁺ has a 3d³ configuration, while Mn²⁺ has a 3d⁵ configuration. For Cr³⁺, the electronic configuration of the free ion is [Ar]3d³. In an octahedral field, the five d-orbitals split into a lower-energy t₂g set and a higher-energy e_g set. The three d-electrons occupy the three t₂g orbitals singly according to Hund’s rule. ______ _______ _________ ___ ____ _______ _______ _________ _____ _____ ______ ____.
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