A first row transition metal in its +2 oxidation state has a spin-only magnetic moment value of 3.86 BM. The atomic number of the metal is:

Question

Canvas Classes · Accepted Answer

Spin-only magnetic moment:  BM

Given  BM:

Need ion with 3 unpaired electrons in +2 state:

| Z | M²⁺ Config | Unpaired e⁻ |
|---|------------|-------------|
| 26 (Fe) |  | 4 |
| 25 (Mn) |  | 5 |
| 23 (V) |  | 3 ✓ |
| 22 (Ti) |  | 2 |

:  → 3 unpaired electrons →  BM ✓

Answer: Option (3) — Z = 23 (Vanadium)

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