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The hypothetical He2 molecule would from from a formation of molecular orbitals from Helium's 1s orbitals. Whenever a molecular orbital is formed, there are two options, the constructive interference (bonding) MO, which has a lower energy than the atomic orbitals, and the destructive interference (antibonding) MO, which has a higher energy than the atomic orbitals. Since each He contributes two electrons to the molecule, there are enough electrons to fill both the bonding and antibonding MOs, giving an overall bond order of zero. This means the molecule does not hold together. Compare this to H2 where each atom only contributes one electron, filling only the bonding MO, giving a bond order of 1.

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Q: Why will the He2 molecule will not form according to MOT?
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