Question

write three main postulates of VSEPR Theory .

Answer 1

1. The shape of a molecules depends upon the no. of valence shells..
2.pairs of electron in the valence shells repel one another since their electron clouds are negatively charged
3.These pairs of electron tend to occupy such position in space that minimises distance.

Answer 2

The three main postulates of VSEPR Theory are:

• VSEPR theory means Valence Shell Electron Pair Repulsion Theory.
• It is a method used in chemistry to determine an individual molecule's geometry.

The three main postulates of this theory are:

1. If the molecule consists of two or more atoms (polyatomic), then there will exist a central atom and all the remaining atoms will be linked to it. Each molecule's shape will depend entirely on the electron pair's total number present in the molecule's valence shell.
2. The electron pairs reorient themselves to reduce the electron-electron repulsion as a result of which the distance between the pairs increases.
3. If bond pairs of electrons are present around the central atom, then the molecule will have an asymmetrical shape. If both bond pairs and lone pairs surround the central atom, then the molecule will have a bent or distorted shape.