Various postulates of Bohr’s atomic model are: 1. In an atom, the electrons revolve around the nucleus in certain definite circular paths called orbits, or shells. 2. Each shell or orbit corresponds to a definite energy. Therefore, these circular orbits are also known as energy levels or energy shells.
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In 1913, Niels Bohr put forward his theory regarding the structure of an atom. He retained the main features of Rutherford’s nuclear model and proposed some modifications. The proposed model is known as Bohr’s model. Its salient features are as follows.