Give the essential postulates of Bohr's model of an atom. How did it explain.
(i) the stability of a atom
(ii) origin of spectral lines in hydrogen atom ?

Explanation

`1s^2 2s^2 2p^6 3s^2, 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2, 1s^2 2s^2 2p^6 4s^1 3d^5, 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^(10) 4p^5`.