If the magnetic moment of a di-oxygen species is 1.73 BM, it may be

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Magnetic moment  BM.
For 1.73 BM:  → n = 1 unpaired electron.

Step 1 — Count unpaired electrons:

| Species | e⁻ | Unpaired e⁻ |
|---------|-----|-------------|
|  | 16 | 2 (μ = 2.83 BM) |
|  | 15 | 1 ✓ (μ = 1.73 BM) |
|  | 17 | 1 ✓ (μ = 1.73 BM) |
|  | 18 | 0 (μ = 0 BM) |

Step 2:  and  both have 1 unpaired electron → μ = 1.73 BM

Answer: Option (1) —  or

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