Question

Name the following

A molecule with one lone pair and three bond pairs

Answer 1

lone pair :

lone pair is the pair of electron that does not participate in bonding in a molecule.

Bond pair :

Bond pair is the pair of electron that takes part in the formation of a covalent bond.

Explanation:

A molecule that has 3 bond pairs and one lone pair is ammonia (${\mathrm{NH}}_3$). Here, the central atom is Nitrogen and three hydrogen atoms have formed one covalent bond each with nitrogen.

Since, Nitrogen has 5 electrons in its outer shell, out of which 3 electrons have formed bond with Hydrogen, so, 2 electrons do not participate in bonding. Hence, there is one lone pair of electron in the molecule.