Question

How can you say that Bonding Molecular Orbital has less energy than Anti-bonding Molecular Orbital?​

Answer 1

Answer:

There are six degenerate p atomic orbitals (three from each atom) that combine to form six molecular orbitals, three bonding and three antibonding. The bonding molecular orbitals are lower in energy than the atomic orbitals because of the increased stability associated with the formation of a bond.

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Answer 2

Answer:

A bonding molecular orbital is always lower in energy (more stable) than the component atomic orbitals, whereas an antibonding molecular orbital is always higher in energy (less stable). The two available electrons (one from each H atom) in this diagram fill the bonding σ 1 s molecular orbital.

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