Word Count : 242

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Cobalt has atomic number 27 and the electronic configuration [Ar] 3d⁷4s². In the +3 oxidation state, cobalt loses two 4s electrons and one 3d electron to give Co³⁺ with a 3d⁶ configuration. In octahedral complexes, the arrangement of electrons depends strongly on the nature of the ligands, because _________ _________ __________ ____ ___ _________ __________ ______.
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