Question

what is the difference between atom molecules and element?

Answer 1

Atom: An atom is the smallest particle of matter. For example, carbon atom, oxygen atom, etc.

Molecule: A molecule is made up of two or more than two atoms.

If all the atoms constituting a molecule are same, the molecule is called homo-atomic molecule. For example, H2, O2, etc,

If the atoms constituting a molecule are different, the molecule is called hetero-atomic molecule. For example, CH4, CO2, H2O, etc.

Element: An element is made up of large number of similar type of atoms.

Compound: A compound is made of a large number of molecules(homo-atomic or hetero-atomic).

Answer 2

Atom is the smallest particle in a matter which takes part in a chemical reaction.

Molecules are formed by combining atoms of same element or different elements.

Element is a pure substance of one type of atom.