model of the atom

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  • model of the atom
    • new evidence leads to new models
    • 1. Dalton originally thought atoms were tiny little spheres that couldn't be divided
    • electrons were discovered
      • 2. J.J.Thompson suggested plum pudding model
        • atoms were a ball of positive charge with electrons in it
    • alpha particle scattering experiment
      • fired dense + alpha particles at thin gold foil. plum pudding model suggested they would bounce. however some passed through
        • 3.Rutherfords nuclear model
          • cloud of electrons
          • tiny + nucleus in centre
    • electrons orbit in shells
      • 4. Bohr model
    • 5. Chadwick discovered neutrons which explained how isotopes had same number protons but different mass numbers


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