What is atomicity? Give an example each of monoatomic, diatomic, triatomic and octatomic molecule.

The number of atoms present in a molecule of an element is called its atomicity. [1 Mark]
Molecules can be monoatomic, diatomic or even polyatomic.
Example of monoatomic molecule - Helium. [0.5 Mark]
Example of diatomic molecule - Hydrogen. [0.5 Mark]
Example of triatomic molecule - Ozone. [0.5 Mark]
Example of octatomic molecule - Sulphur. [0.5 Mark]