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Calculate the spin-only magnetic moment of a divalent ion of Mn (Z = 25):

A5.92 BM
B2.84 BM
C1.73 BM
D4.90 BM
Answer & Solution
Correct answer: A. 5.92 BM
Mn (Z=25): [Ar] 3d⁵ 4s². Mn²⁺ loses two 4s electrons → **3d⁵, n = 5 unpaired**. μ = √(5×7) = **√35 ≈ 5.92 BM**.
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