Writer Bohr's postulates for the hydrogen atom model.

Explanation

1.Every atom consists of a central core called nucleus where the entire positive charge , and almost the entire mass of the atom are concentrated. A specific number of electrons revolve around the nucleus in circular orbits. The centripetal force requireds for this revolution is provided by the electrostatic force of attraction between the electron and the nucleus .
i.e., `F_c=F_e`
2.According to Bohr, electrons revolve only in certain discrete non-radiating orbits called stationary orbits for which the total angular momentum of the revolving electrons is an integral multiple of `h//2pi`.
`mvr=(nh)/(2pi)`
n=1,2,3,....
h=Planck.s constant .
3.The emission/absorption of energy occurs only when an electron jumps from one of its specified non-radiating orbit to another.
`hgamma =epsilon_2-epsilon_1`.