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Molecular Orbital Theory: Features, Lcao

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Molecular Orbital Theory: Features, Lcao - Lesson Summary

Atomic orbitals of equivalent energies combine to form molecular orbitals. Atomic orbitals will combine in two ways, Combination by addition and

Combination by subtraction based on phase merging. During combination if the electrons in both orbitals in same phase then they combine by addition.

During the combination if the electrons in both the orbitals are out of phase then they will combine by subtraction.

Features of Molecular orbital Theory:

Two atomic orbitals combine to form two molecular orbitals, known as bonding molecular orbital, denoted by sigma, and anti-bonding molecular orbital, denoted by sigma asterisk.

Bonding molecular orbitals have lesser energy than anti-bonding orbitals.

The less energy of bonding molecular orbitals on comparison to atomic orbitals called as stabilizing energy. And anti-bonding orbitals will have higher energy than atomic orbitals called as destabilizing energy.

Molecular orbitals are filled according the energy of the orbitals.

Molecular orbitals either bonding or anti-bonding orbitals will accommodate maximum of two electrons.

In the case of degenerate molecular orbitals the filling orbitals with electrons takes place when the available orbitals half filled.

During the combination of atomic orbitals

Number of molecular orbitals formed = Number of atomic orbitals combined.


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