What are the postulates of Bohr's model of hydrogen atom?

Explanation

Postulates:
1) Niels Bohr proposed that electrons in an atom occupy 'stationary' orbits of fixed energy at different distances from the nucleus
2) When an electron jumps from a lower energy state (ground state) to higher energy state it absorbs energy or emits energy when such a jump occurs from a higher energy state.
3) The energies of an electron in an atom can have only certain values `E_(1) , E_(2) , E_(5)`.... that is, the energy is quantized.