Question

1. Why are electron domains so influential in determining the molecular shape of different molecules?
2. Are these bonds mostly sigma bonds or pi bonds, why?
3. Do we see many metals in these molecules? Why or why not?

Answer 1

1. The electron domain refers to the number of lone pairs and bond locations. The bond locations can be single, double or triple bonds i.e. they can be both sigma and pi bonds.

According to the VSEPR theory we can determine the geometry and shape of a molecule if we know about it's lone pairs and bond pairs that is the electron domains.

This is based on the concept that the bond pairs and lone pairs have elctrons, these electrons present in electron domains repel each other. Bond pairs repel both bond pairs and lone pairs, similarly lone pairs repel both bond pairs and lone pairs.

Therefore the molecules align in particular shapes in order to keep the elctron domains as far as possible.

Sorry brother I am clearly asked to answer only one question in case multiple questions are asked to answer.

Hope it helps.