Discussion
Which of the following diatomic molecules is paramagnetic ?
Answer: A
The paramagnetic molecule is B2.
For the light diatomics up to N2, s-p mixing places the π2p orbitals below σ2p. B2 has 6 valence electrons: σ2s2 σ*2s2 π2p2. The two π electrons occupy the two degenerate π2p orbitals singly (Hund's rule), so B2 has two unpaired electrons and is paramagnetic.
C2 (π2p4) and N2 (π2p4 σ2p2) have all electrons paired. F2 fills π*2p4, also leaving no unpaired electron, so all three are diamagnetic.
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