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Although Cr^3+ and Co^2+ ions have same number of unpaired electrons but the magnetic moment of Cr^3+ is 3.87 B.M.

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Although Cr3+ and Co2+ ions have same number of unpaired electrons but the magnetic moment of Cr3+ is 3.87 B.M. and that of Co2+ is 4.87 B.M. Why?

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Due to symmetrical electronic configuration there is no orbital contribution in Cr3+ ion. However appreciable orbital contribution takes place in Co2+ ion.

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