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Answer» Most of the space in the atom is empty. The radius of the atom is about `10^(-10)` m while that of nucleus is `10^(-15)` m. Electrons move in a circular path of FIXED energy CALLED orbits. Electrons and the nucleus are HELD together by electrostatic forces of attraction.
Solution :oncept of electrons move in a circular path of fixed energy called orbits was put forward by Bohr and not derived from R utherford.s scattering experiment. Out of a large NUMBER of circular orbits theoretically possible AROUND the nucleus, the electron revolve only in those orbits which have a tired value of energy. So, these orbits are called energy level or stationary states
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