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A dioxygen species shows a magnetic moment of 1.73 B.M. The species could be:

1. O2- or O2+
2. O2 or O2+
3. O2 or O2-
4. O2, O2- or O2+

Correct answer: O2- or O2+

Solution

mu = 1.73 B.M means one unpaired electron. O2 has 2 unpaired electrons, but O2+ (remove one pi* electron) and O2- (one pi* orbital becomes singly filled after pairing) each have exactly one unpaired electron.

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