What are the postulates of molecular orbital theory class 11?

The number of atomic orbitals undergoing combination will be equal to the number of molecular orbitals formed. Two molecular orbitals are formed by the combination of two atomic orbitals. One molecular orbital has low energy and others will have high energy.

What is molecular orbital theory gives with example?

For example, e.g. O2 has 6 + 6 = 12 valence electrons which can be placed in bonding and anti-bonding orbitals. Notice that Molecular Orbital Theory predicts that O2 has unpaired electrons, so it will be paramagnetic….Molecular Orbital Theory.

How many types of molecular orbitals are there?

When atomic orbitals interact, the resulting molecular orbital can be of three types: bonding, antibonding, or nonbonding. Bonding MOs: Bonding interactions between atomic orbitals are constructive (in-phase) interactions. Bonding MOs are lower in energy than the atomic orbitals that combine to produce them.

Is O2 stable according to MO theory?

In O2 and F2, there is a crossover of the sigma and the pi ortbials: the relative energies of the sigma orbitals drop below that of the pi orbitals’. Information from the MO diagram justify O2’s stability and show that it’s bonding order is 2.

What are the main postulates of valence shell electron?

(i) The shape of a molecule depends upon the number of valence shell electron pairs (bonded or non-bonded) around the central atom. (ii) Electron pairs in the valence shell repel one another since their electron clouds are negatively charged.

What are the limitations of VB theory?

Limitations of Valence Bond Theory They are: It fails to explain the tetravalency of carbon. This theory does not discuss the electrons’ energies. The assumptions are about the electrons being localized to specific locations.