drawbacks of j j thomson atomic models
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Sir Joseph John "J. J." Thomson, (18 December 1856 – 30 August 1940) ... He is credited for the discovery of theelectron and of isotopes, and the invention of the mass spectrometer. Thomson was awarded the 1906 Nobel Prize in Physics for the discovery of the electron and for his work on the conduction of electricity in gases.
Thomson's model of atom : Plum pudding model
Features: An atom consists of positively charged sphere and the electrons are embedded in it. So mass of the atom is assumed to be uniformly distributed. The negative and positive charges are equal in magnitude. Hence, this model was able to explain the overall neutrality of an atom.
Limitation: Even though the J.J.Thomson theory explained the overall neutrality of an atom, it was not consistent with the results of Rutherford's experiment.
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ACCORDING TO THOMSON'S MODEL IT IS SEEN THAT PROTONS,ELECTRONS & NEUTRONS ARE EQUALLY ARRANGED. BUT FROM RUTHERFORD'S ALPHA PARTICLE SCATTERING EXPERIMENT IT WAS NOTED THAT MOST OF THE SPACE IN AN ATOM IS EMPTY BECAUSE MOST OF THE ALPHA PARTICLES PASSED THROUGH METAL FOIL WITHOUT REFLECTION.THUS THOMSON'S MODEL OF AN ATOM COULD NOT EXPLAIN ALPHA PARTICLE SCATTERING PHENOMENON. ALSO THIS MODEL EXPLAINS THE ELECTRICAL NEUTRALITY OF AN ATOM BUT IS NOT CONSISTENT WITH THE EXPERIMENTAL RESULTS....
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