Question

Give the postulates of Bohr's atomic model.

Answer 1

The Bohr's postulates -

1) An electron can revolve around the nucleus in certainly fixed orbits of definite energy without emission of any radiant energy. Such orbits are called stationary orbits.

2) An electron can make a transition from a stationary state of higher energy E2 to a state of lower energy E1 and in doing so, it emits a single photon of frequency,

ν = (E2−E1)/h where h is the Planck's constant.

Conversely, on absorbing an energy, E2−E1when the electron is at energy E1, the electron can make a transition from E1 to E2.

3) Only those orbits are allowed for which the angular momentum of the electron is an integral multiple of h/2π,

Thus, L=nh/2π where n=0,1,2,.....