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The Evolution of the Atomic Theory

Rutherford-1898

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Ernest Rutherford-

     Rutherford designed an alpha-particle distribution experiment using a radioactive source and gold foil. He observed that most of the particles passed through foil un-deflected, but some slightly deflected and a very few reflected.

      His atomic theory described the atom as having a central positive nucleus surrounded by negative electrons in an orbit. This model suggested that the majority of the mass of the atom was found in the small nucleus, and that the rest of the atom was mostly empty space. He also designed the Plum Pudding model.

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This is the experiment that Rutherford used

In 1914, Rutherford was knighted by the Queen, now called Sir Ernest Rutherford.

Chemirty 11 project The Evolution of the Atomic Theory