Question

Differentiate between an atom and a molecule. Can an atom of an element and its molecule be the same? If yes, give an example.

Answer 1

Atom	Molecule
Atoms may or may not exist freely depending upon their valency.	All molecules can exist freely.
An atom is the smallest particle in an element that has all the properties of the element. It is not possible to further breakdown an atom through chemical means.	Molecules may or may not be classified as smallest particles of matter depending upon whether they are monatomic or not. Molecules can be subdivided to individual atoms by chemical processes.
Atoms cannot be seen through naked eye or through high-resolution microscope. They can be observed only with an electron microscope.	Molecules cannot be seen through naked eye but can be seen through high-resolution microscope.
Atoms are made up of electrons, protons and neurons.	Molecules are made up of atoms of same or different elements.
Example: N, O, Fe, H	Example: N2, H2, H2O, He

Yes, an atom of an element and its molecule be same. For example, an atom and a molecule of calcium metal (Ca) is same.