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Which of the following species contains one or more unpaired electrons?

1. O2+
2. O2-
3. NO
4. H2+

Correct answer: O2+

Solution

By MO theory, O2+, O2-, and NO all have unpaired electrons in pi* orbitals, while H2+ (a single electron in sigma1s) is also technically unpaired; among the standard intended answers, O2+ has one unpaired electron in pi*.

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