Tuesday, 13 September 2011

Bohr's Atomic Model

According To Rutherford's nuclear atomic model, an atom has a nucleus and negative electrons which are revolving round the nucleus  in the same way as the planets revolve round the sun in the solar system.This model could not say anything as to how and where these electrons were arranged.

This model could also not explain how the spectral lines are produced by the simplest atoms like hydrogen atom when an electron jumps from one orbit to another.

In order to explain why an electron revolving round the nucleus does not lose energy and consequently does not fall into the nucleus and how the spectral lines of the emission spectrum of H-atom are produced when aan electron jumps from one energy level to other, Niels Bohr, a Danish Physicist, in 1913, put forward a new atomic model which is based on Planck's quantum theory of radiation.

Before, we could deal with Bohr's atomic model we should have a clear understanding of the following topics:

  • Electromagnetic radiations (or waves) and nature of  radiations emitted by electron.
  • Emission spectrum, continuous spectrum and line spectrum of hydrogen atom.
  • Plank's quantum theory of radiation, and its application in explaining photoelectric effect and Compton effect.

No comments:

Post a Comment