From the a-particle scattering experiment, Rutherford concluded that :

From the α scattering experiment, Rutherford concluded that:
(a)There is a positively charged center in the atom called the nucleus. Nearby all the mass of an atom resides in the nucleus
(b)Electrons resolve around the nucleus in well defined orbitals.
(c)The size of nucleus is very small compared to that of an atom.
→Scattering follows columb's law
→Radius of nucleus is less than ${10}^{-14}\mathrm{m}$
→α particles can approach with an distance of the order of ${10}^{-14}\mathrm{m}$
m of the nucleus