# What are the postulates of Bohr's atomic model?

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Jun 6, 2017

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,

$\nu = \frac{{E}_{2} - {E}_{1}}{h}$ 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 $\frac{h}{2 \pi}$,

Thus, $L = \frac{n h}{2 \pi}$ where $n = 0 , 1 , 2 , \ldots . .$

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