Question

Write atleast 5 main points postulates of VSEPR theory.​

Answer 1

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The main points postulates of VSEPR theory are as follows :

1. The shape of a molecule depends upon the number of valence shell electron pairs (bonded or non-bonded) around the central atom.

2. Pairs of electrons in the valence shell repel one another since their electron clouds are negatively charged.

3. These pairs of electrons tend to occupy such positions in space that minimise repulsion and thus maximise distance between them.

4.The valence shell is taken as a sphere with the electron pairs localising on the spherical surface at maximum distance from one another.

5. 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 super pair.

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Answer 2

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• The shape of a molecule depends upon the number of electron pairs in the valence shell of the central atom.
• Electron pair in the valence shell repel one another since their electron clouds are negatively charged.
• The electron pairs in the valence shell occupy their position in space around the central atom in a such a way that the distance between them is maximum and the molecule acquires a state of minimum energy and maximum stability.
• The repulsive interactions of electron pairs decrease in the order → lone pair-lone pair > lone pair-bond pair > bond pair-bond pair
• The repulsion is maximum in the body when the angle is 90⁰ and minimum at 180⁰