The terms atom and molecule

Atoms	Molecules
The smallest particle of an element is called atom.	The smallest particles of an element or compound which can exist independent is called molecules.
Atoms consists of electron, proton and neutron.	Molecule are made up of different types of atom.
Atom can take part in chemical reactions directly.	Molecules cannot take part in chemical reaction without breaking up into atoms.
There are limited types of atom in the earth.	There are unlimited types of molecules.