Chemisty Unit 1 - Topic 2

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7 Terms

1
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Democritus

  • first to suggest that atoms existed (“atomos”)

  • could not explain chemical behavior

  • Grandfather of Chemistry

2
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John Dalton

  • mass ratio experiments

  • Billiard Ball model

  • Dalton’s Atomic Theory

3
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J. J. Thomson

  • cathode ray experiment

  • Plum Pudding model

  • discovered the electron

4
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Robert Millikan

  • oil drop experiment

  • determined the charge and mass of the electron

5
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Ernest Rutherford

  • gold foil experiment

  • Nuclear model

  • discovered the nucleus

6
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James Chadwick

  • discovered the neutron

7
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Niels Bohr

  • atomic emission/absorption experiments

  • Planetary model

  • found that electrons move in a fixed path around the nucleus

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