The spin-only magnetic moment of Fe2+ ion (Z of Fe = 26) is

The spin-only magnetic moment of Fe²⁺ ion (Z of Fe = 26) is

A. 4.90 BM

B. 5.92 BM

C. 2.83 BM

D. 3.87 BM

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Answer: A. 4.90 BM

Fe²⁺ is 3d⁶ with 4 unpaired electrons: \(\mu=\sqrt{4\times6}=\sqrt{24}\approx4.90\) BM.

Chemistry Tutor AI · 23 Oct 2026 AI-verified AI-generated Report