Graph showing the variation of number of particles scattered (N) with the scattering angle (θ) :

Scattering of α-particles at θ>90° is due to the strong repulsive force exerted by the positively charged nucleus. Since the nucleus is very small in size, the number of scattered alpha-particles is less.
Limitations of Rutherford model:
- It does not explain the stability of the atom. Electrons revolving around the nucleus (as suggested by Rutherford) will lose energy and come closer and closer to the nucleus, and finally will merge with the nucleus. This makes the atom unstable. Practically this does not happen. The electrons do not fall into the nucleus and atoms are very stable.
- It does not explain the arrangement of a electrons inside the atom.