Question

Which of the following conclusions could not be derived from Rutherford’s a-particle scattering experiment?

• A. Most of the space in the atom is empty
• B. The radius of the atom is about $10^{-10}\,m$ while that of nucleus is $10^{-15}\, m$
• C. Electrons move in a circular path of fixed energy called orbits
• D. Electrons and the nucleus are held together by electrostatic forces of attraction

Answer 1

Answer: (C)

On the basis of Rutherford's $\alpha$ -particles scattering experiment, the nuclear model of atom was proposed as:

(i) Positive charge and most of the mass of the atom is densely concentrated in extremely small region called nucleus. If atom radii is $10^{-10} m$ then nucleus is $10^{-15} m$

(ii) The nucleus is surrounded by electrons that move around the nucleus with a very high speed in circular paths called orbits. The atomic model resembles the solar system in which the nucleus plays the role of sun and the electrons that of revolving planets.

(iii) Electrons and the nucleus are held together by electrostatic forces of attraction therefore the concept of stationary state or orbits with fixed energy was given by Bohr's theory and not by Rutherford's theory.