Define what is vsepr theory?

VSEPR stands for valence shell electron pair repulsion theory in which helps in predicting the geometric shape of a molecule based upon the number of lone pairs of electrons.

It is also called the Gillespie-Nyholm theory after its two main discoverers, Ronald Gillespie and Ronald Nyholm.

In this theory the lone pair of atoms of the valence shell repel each other and attain such an angular position which minimizes the repulsion between the lone pair of electrons and the bonded pair of electrons so that it attains a stable state.

This theory is however not related to the wave function and the orbital hybridization but is based only upon the electron density.

DaintyHeart DaintyHeart · Answer 2 · 2022-07-23T13:37:22+02:00

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The shape of molecule depend upon the number of valence shell electron pairs (bonded or nonbonded) around the central atom.
Pairs of electron in the valence shelk repel one another since their electron clouds are negatively charged.
These pairs of electron tend to occupy such positions in space that minimise repulsion and thus maximise distance between them.
The valence shell is taken as sphere with the electrins pairs localising on the spherical surface at maximum distance from one another.
A multiple bond is treated as if it is a single electron pair and the two or three electron pairs of a multiple bond are treated as a single auper pair.
When two or more resonance structure can represent a molecule, the VSEPR model is applicable to any such structure.