drawbacks of j j thomson atomic models

 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. 

• 1 Biography
• 2 Career
  • 2.1 Discovery of the electron
  • 2.2 Isotopes and mass spectrometry
  • 2.3 Other work
• 3 Experiments with cathode rays
  • 3.1 Experiments on the magnetic deflection of cathode rays
  • 3.2 Experiment to show that cathode rays were electrically charged
  • 3.3 Experiment to show that cathode rays could be deflected electrically
  • 3.4 Experiment to measure the mass to charge ratio of cathode rays
  • 3.5 Conclusions
• 4 Awards and recognition
• 5 Notes
• 6 References
• 7 External links

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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This model could explain the electrical neutrality of the atom but failed to explain the observations of the Rutherford alpha particle scattering experiment.

Hi,

Thomson model of atom was not able to explain the results of experiments obtained by other scientists such as Earnest Rutherford, who was performing experiments on radioactivity.

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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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 it failed to explain:

(1)how the positive and negative charges are arranged in an atom .

 (2)there is no experimental proof of his atomic model.

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(3)there is no electronic configuration of sub-atomic particles (electrons,protons and neutrons) given by his model.