Molecular Geometry and Bonding Theories

Covalent Bonding and Orbital Overlap


Covalent Bonding and Orbital Overlap

Quantum mechanics and molecular orbitals

"Valence bond theory"

Combine Lewis' idea of electron pair bonds with electron orbitals (quantum mechanics)

Covalent bonding occurs when atoms share electrons (Lewis model)

The buildup of electron density between two nuclei occurs when a valence atomic orbital of one atom merges with that of another atom (Valence bond theory)

There is an optimum distance between two bonded nuclei in covalent bonds:

Therefore:

The observed bond length is the distance at which the attractive forces (nuclei for bonding electrons) is balance by the repulsive force (nuclei vs. nuclei; and additionally, electron vs. electron)


1996 Michael Blaber