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Using Molecular Orbital Theory, find the number of antibonding electron pairs in the O2 molecule. (Atomic number of O = 8)

1. 1
2. 2
3. 3
4. 4

Correct answer: 3

Solution

O2 has 16 electrons. MO filling order: sigma(1s)², sigma*(1s)², sigma(2s)², sigma*(2s)², sigma(2p)², pi(2p)⁴, pi*(2p)². Antibonding MOs occupied: sigma*(1s) with 2e, sigma*(2s) with 2e, pi*(2p) with 2e = 6 electrons = 3 pairs.

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