The radius of an atom is of the order of 

On the basis of scattering experiments, Rutherford proposed the model of an atom, which is known as the nuclear atomic model.
According to this model -
(i) An atom consists of a heavy positively charged nucleus where all the protons are present.
(ii) The volume of the nucleus is very small and is only a minute fraction of the total volume of the atom.

• Nucleus has a radius of the order of 10⁻¹³cm and the atom has a radius of the order of 10⁻⁸cm.