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Exercises1. Compare the properties of electrons, protons and neutrons2. What are the limitations of J.J. Thomson's model of the atom?3. What are the limitations of Rutherford's model of the atom?4. Describe Bohr's model of the atom.5. Compare all the proposed models of an atom given in thischapter.6. Summarise the rules for writing of distribution of electrons invarious shells for the first eighteen elements.7. Define valency by taking examples of silicon and oxygen.SCIENCE​

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