Question

describe Molecular orbital therory...

Answer 1

Molecular orbital theory developed by hand and Mulliken and it suggest that in molecules electron are present in new orbitals called molecular orbitals and that they are not associated with the atoms. Important postulates of the theory are as under:

a) A molecular orbital is the reason in three dimensional space around two or more nuclei of the molecules, where the probability of finding an electron is maximum.

b) Molecular orbitals are formed by the combination of atomic orbitals of nearly equal energies.

c) The number of molecular orbitals formed is equal to the number of combining atomic orbitals. Half of these are called bonding M.O. (lower energy) while other half are called antibonding M.O. (higher energy).

d) Shapes of the M.O. depend on the shape of combining atomic orbitals.

e) Filling of electron in various M.O. takes place according to Aufbau, Pauli and Hund's rule similar to the rules of for filling of atomic orbitals.

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Answer 2

Hey here is your answer
and same pinch for this because this topic i have also read few days back....

In chemistry, molecular orbital (MO) theory is a method for describing the electronic structure of molecules.Electrons are not assigned to individual bonds between atoms, but are treated as moving under the influence of the nuclei in the whole molecule.[1] The spatial and energetic properties of electrons are described by quantum mechanics as atomic or molecular orbitals that contain these electrons. While atomic orbitals contain electrons ascribed to a single atom, molecular orbitals surround two or more atoms in a molecule and contain valence electrons between atoms. Molecular orbital theory, which was proposed in the early twentieth century, revolutionized the study of bonding by approximating the states of bonded electrons—the molecular orbitals—as linear combinations of atomic orbitals (LCAO). These approximations are now made by applying the density functional theory (DFT) or Hartree–Fock (HF) models to the Schrödinger equation