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Molecular Orbitals between Two Atoms that are Different Elements

Posted: Tue Nov 01, 2016 1:18 pm
by Jessica Chern 1H
This is based off homework question 4.57. I understand why the bonding orbitals would be closer to the more electronegative atom in energy (because of the greater pull on electrons), but why are the antibonding orbitals closer to the less electronegative atom in energy?

Re: Molecular Orbitals between Two Atoms that are Different Elements

Posted: Tue Nov 01, 2016 8:07 pm
by Miya McLaughlin 2B
The anti-bonding orbitals have a higher energy because they are less stable than the bonding orbitals. This is because they are farther away from the nuclei of the atoms. Stability = lower energy.
This higher energy level, means anti-bonding orbitals are closer in energy to the less electronegative atom, which have a higher energy level in general than the more electronegative atom by comparison.