What Is VSEPR theory?

It provides a simple method to predict the shape of covalent molecules

Developed by Gillespie and Nyholm.

This theory is primarily based upon the fact that in a polyatomic molecule the direction of bonds around central atom depends upon the total number of electron pairs in its valance shell.

The main features of this theory:

  1. The electron pair surrounds the central atom repel each other,consequently , they stay as far as possible in space to attain maximum stability.
  2. The geometry and shape of the molecule depend upon the number of electron pairs surrunding the central atom.
  3. The repulsive interaction between the lone pairs are different from these between two bond pairs or those between lone pairs and lone pair.

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