What is the spin-only magnetic moment of Fe³⁺ (Fe, Z = 26)?
Correct answer D. 5.92 BM
Explanation
Fe³⁺ is 3d⁵ with n = 5 unpaired electrons. Spin-only moment μ = √(n(n + 2)) = √(5 × 7) = √35 = 5.92 BM.
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