Two or more elements may combine to form a molecule

Carbon and Oxygen are both elements and they combine chemically to form a new substance known as Carbon (IV) Oxide.

A compound is a substance made up of two or more

elements chemically combined.

All compounds consists of two or more elements chemically combined together and exist as single particles.

The smallest particle of an element or compound

which can exist in a free and separate state is

called a Molecule.