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Becquerel showed that atoms were able to emit smaller particles. Hence atoms must be divisible!
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JJ Thomson discovered the electron and proposed the "plumb pudding" atomic model
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New Zealander, Ernest Rutherford discovered the alpha particle.
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Becquerel identifies the beta particles as electrons.
Paul Villard identified the differences between gamma rays, X-rays, and other radiation types. -
Rutherford, Hans Geiger and Ernest Marsden carried out the Gold Foil experiment and began establishing the Rutherford-Bohr Atomic Model
