Question

Give three postulates of VSEPR theory

Answer 1

Answer:

1.In polyatomics molecules (i.e molecules made up of three or more atoms)..

2. one of the constituent atoms is identified as the central atom to which all other atoms belonging to the molecule or linked...

3.The total number of valence shell electrons pair decides the shape of the molecule......

Answer 2

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Main postulates of VSEPR theory :-

• 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