Rutherford’s model of an atom

Discussion in 'CBSE Class 9 Chemistry Help' started by phani, Jan 1, 2012.

  1. phani

    phani Member Staff Member

    Rutherford’s model of an atom
    • Ernest Rutherford bombarded a very thin gold foil with fast moving a]pha (a) particles in his experiment.
    • Alpha particles are positively charged having +2 units of charge and 4 units of mass.
    • Observation and conclusive inferences of Rutherford’s alpha particle scattcdng experiment are given below:
  2. phani

    phani Member Staff Member

    Conclusions drawn by Rutherford
    • An atom consists of a positively charged centre called nucleus.
    • Nearly all mass of the atom is in the nucleus.
    • The size of the nucleus is very small as compared to the size of the atom.
    + The electrons revolve around the nucleus in well-defined fixed orbits like planets move around the sun.
  3. phani

    phani Member Staff Member

    Drawbacks of Rutherford’s model
    • it does not explain stability of an atom.
    • According to electromagnetic theory, an accelerated charged particle must radiate energy continuously, it will mean that the negatively charged electrons revolving around the nucleus with accelerated motion will lose energy continuously This would lead to decrease in their energy and their speed will also go on decreasing So these will be pulled strongly towards the positively charged nucleus. Thus they would take a spiral path and merge into the nucleus. This should collapse. But this does not happen at all.
    should make the atom very unstable and it

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