What are/is the difference between atoms and molecules?

1. An atom is the smallest particle in an Element.

2. Atoms do not exists in free state.

Exception -Noble gases.

3.Atoms are highly reactive in nature.

Exception-Noble gases.

4. Atoms do not have a chemical bond.

1.A molecule is the smallest particle of an element or a compound.

2. Molecules exists in free state.

3. Molecules are less reactive .

4.Atoms in a molecule are held by a chemical bond.