explain thory in detail.

explain thory in detail.

Grade:12th Pass

1 Answers

Aman Bansal
592 Points
12 years ago


Dear Radhakrishna,

Principles of Molecular Orbital Theory 


total number of molecular orbits is equal to the total number of atomic orbitals from combining atoms


The molecule His composed of two H atoms. Both H atoms have a 1s orbital, so when bonded together, there are therefore two molecular orbitals.  



Bonding molecular orbitals have less energythan the constituent atomic orbitals before bonding

Antibonding molecular orbitals have more energy than the constituent atomic orbitals before bonding.  


Bonding molecular orbitals help stabilize a system of atoms since less energy is associated with bonded atoms as opposed to a system of unbound atoms.

Likewise, antibonding molecular orbitals cause a system to be unstabilized since more energy is associated with bonded atoms than that of a system of unbound atoms.


Following both the Pauli exclusion principle and Hunds rule, electrons fill in orbitals of increasing energy.


 Electrons fill orbitals with the lowest energy first. No more than 2 electrons can occupy 1 molecular orbital at a time. Furthermore, all orbitals at an energy level must be filled with one electron before they can be paired.  (see second diagram below)

Atomic orbitals are best formed when composed of atomic orbitals of like energies.


Molecular Orbital Configuration of Li2:


The bonding (s1s)2 and antibonding (s*1s)2 cancel each other out, leaving (s2s)2 as the valence electrons involved in the atoms bonding. 



















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