Question

What are the postulates of Bohr's atomic model?

Answer 1

The Bohr's postulates -

1) An electron can revolve around the nucleus in certain 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 `E_2` to a state of lower energy `E_1` and in doing so, it emits a single photon of frequency,

`nu = (E_2 - E_1)/h` where `h` is the Planck's constant.

Conversely, on absorbing an energy, `E_2 - E_1` when the electron is at energy `E_1`, the electron can make a transition from `E_1` to `E_2`.

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

Thus, `L = (nh)/(2pi)` where `n = 0,1,2,.....`