History of an Atom Chemistry AQA Single Science

  • Created by: MaganjotC
  • Created on: 17-04-19 10:51
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  • History of the Atom
    • John Dalton
      • described them as solid spheres
      • different spheres made up the different elements
    • J J Thomson
      • concluded that atoms weren't sold spheres
      • measurement of charge and mass showed that an atom had to have electrons
        • smaller negatively charged particles
    • Ernest Rutherford
      • showed that plum pudding was wrong
      • alpha particle scattering experiment
      • diagram here
    • Niels Bohr
      • nuclear model explained that electrons were in shells
      • electrons orbit nucleus in fixed shells
    • solid sphere changed to plum pudding model
      • showed the atom as a ball of positive charge with electrons

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