The electron configuration of cobalt (Z = 27) is 1s²2s²2p⁶3s²3p⁶3d⁷4s² . How many unpaired electrons are in a gaseous Co³⁺ ion in its ground state?

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answer is C.

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Detailed Solution

Co³⁺ : [Ar] 3d⁶

4 unpaired electrons

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