Give the postulates of Bohr's atomic model.

Postulates of Bohr's atomic model are as follows

1. The electrons revolving around the nucleus are confined to certain fixed orbits called shells or energy levels, each of which is associated with a fixed amount of energy.
2. While it is revolving around the nucleus in an orbit, an electron neither loses nor gains energy.
3. An electron revolving in a particular orbit, on gaining a certain amount of energy, jumps to the next orbit and vice verse. Since each orbit is associated with a fixed amount of energy, Bohr called it an energy level.