Question

Define valence bond theory​

Answer 1

Valency Bond theory :

1. Electrons present in the molecule are localised as if they are in isolated atoms.

2.The Atomic orbitals of the combining atoms retain their individual identity.

3. It involves only the increase in the electron density in the region of orbital overlap.

4.The number of covalent bonds formed is equal to the number of combining orbitals.

5.This theory doesn't help in predicting the paramagnetic or diamagnetic behaviour of molecules.

6. It is easy to apply.

7. In this theory resonance is considered.

Answer 2

Valence Bond Theory:

=>Based on quantam Mechanic's, It is an approximation theory that tries to explain the electron pair or covalent bond using quantam mechanics.

A bond will form if:

1. an orbital on one atom comes to occupy a portion of the same region of space as an orbital on the other atom "orbital overlap".
2. the number of electrons on both the orbital is no more than 2.
3. the strength of the bond depends on the amount of overlap. "the greater the overlap = the greater the strength".
4. the electrons are attracted to both nuclei thus pulling the atom together.

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