The fact that B₂ has two unpaired electrons means the 2p_{$\pi $} molecular orbitals have higher energy than the 2p_{$ \sigma $}molecular orbitals .

Question

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In molecular orbital theory, the $2p\pi$ molecular orbitals typically have lower energy than the $2p\sigma$ molecular orbitals for molecules involving the second period elements like nitrogen and oxygen, which means the unpaired electrons would first occupy the lower energy $2p\pi$ orbitals before the higher energy $2p\sigma$ orbitals.

The Fact That B2 Has Two Unpaired Electrons Means the 2p

The Fact That B₂ Has Two Unpaired Electrons Means the 2p