Give the main points of Bohr’s model of atom.

Explanation

The main postulates of Bohr.s model for hydrogen atom are as follows:
(i) In the hydrogen atom electrons are moving around the nucleus in a circular path of fixed radius and energy. These paths are called orbits.
(ii) The energy of an electron in the orbit remains constant with time. On absorbing sufficient amount of energy, electrons move from lower stationary state to a higher stationary state.
(iii) The frequency of radiation absorbed or emitted when transition occurs between two stationary states differ by `Delta E.`
`v = ( Delta E)/(h) = (E _(2) - E _(1))/(h )`
where `E_(1) and E_(2)` are the energies of the lower and higher energy states respectively.
(iv) The angular momentum of an electron in a given stationary state can be expressed in equation as given below: `m _(e) vr = (nh)/(2 pi ) , n = 1,2,3---`