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Assuming that 2s-2p mixing does NOT occur, which of the following diatomic species is paramagnetic?

1. Be2
2. B2
3. C2
4. N2

Correct answer: C2

Solution

With no 2s-2p mixing the ordering is sigma2p below pi2p; C2 (8 valence e-) then has configuration...(sigma2p)²(pi2p)² with the two pi electrons in degenerate orbitals giving 2 unpaired electrons, so C2 is paramagnetic.

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