Differentiate between an atom and a molecule.

Explanation

Atom. An atom is the smallest particle of an element that maintains its chemical identity throughout all chemical and physical changes. Atoms of one element are different from the other elements.
Molecule. A molecule is the smallest particle of an element or compound which can exist alone or freely under ordinary conditions and shows all the properties of that substance (element or compound). A molecule may be made up of one, two or more atoms.