what were the drawbacks of thomson model of atom

Thomson 's model had many drawbacks. The chief among them are:

(i) Since the weight of an electron is about a thousandth part of a hydrogen atom, it would mean that a single atom, especially of the heavier elements, would contain many thousand electrons. But J.J. Thomson himself found that the number of electrons in an atom cannot be greatly different from the atomic weight.

(ii) According to this model, hydrogen can give rise to only one spectral line, contrary to the observed fact of several lines.

(iii) This model could not explain the large angle scattering of alpha particles by thin metal foils

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  1. An atom consists of a positively charged sphere with electrons embedded in it.
  2. The negative and positive charges present inside an atom are equal in magnitude. Therefore, an atom as a whole is electrically neutral.
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J.J.Thomson's model could not explain resuls of the scattering carried out by Rutherford.

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Following are the drawbacks of Thomson’s atomic model:

·  It could not explain the position of nucleus in an atom.

·  It couldn't explain the stability of an atom.

·  It could not explain the appearance of absorption and emission spectra.

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Drawback of J.J Thomson atomic model:

  1. -  Applicable to one electron system
  2. -  Did not explain the atomic emission spectra
  3. -  Did not explain the position of neutron
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J.J. Thomson said that atom consists of a positively charged sphere with embedded electrons in it.
However, later it was found that the atom has concentrated mass and the positively charged nucleus is at the centre while the negatively charged electrons move in the shells around the nucleus.
 
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