Molecular orbital theory :Postulates of this theory are--
- Atoms combine to form molecules and their atomic orbitals also combines to form molecular orbitals.
- Just like electrons are present in an atomic orbitals of an atom similarly in a molecule electrons are present in its molecular orbitals.
- The atomic orbitals of same energy and similar symmetry combines to form molecular orbitals.
- Atomic orbital is mono centric due to one nucleus centre whereas, molecular orbital s are poly centric.
- The number of molecular orbitals forms are equal in number of combining orbitals.
- Two atomic orbitals combine to form one as BMO (bonding molecular orbital) and other as AMO (anti bonding molecular orbital).
- BMO has more stability and less energy than AMO.
- Electrons in molecular orbitals are filled according to Auf-bau's principle, Hund's rule and Pauli's exclusion principle.
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