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Which of the following diatomic species is paramagnetic?

1. B2
2. O2
3. N2
4. He2

Correct answer: O2

Solution

By MO theory, O2 has two unpaired electrons in its pi*2p antibonding orbitals, making it paramagnetic. (B2 is also paramagnetic, but among the standard intended single answer O2 is the classic paramagnetic molecule; N2 and He2 are diamagnetic/nonexistent.)

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