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11 Cards in this Set
- Front
- Back
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Antoine Lavoisier
1700's |
Law of Conservation of Mass
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Joseph Proust
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Law of Definite Proportions
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John Dalton
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Law of Multiple Proportions
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J.J. Thomson (the effect of placing an electric field around tube)
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cathode ray was composed of tiny particles with an electrical charge: these cathode ray particles became known as electrons
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J.J. Thompson
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Plum Pudding Atom
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Henri Becquerel and Marie Curie
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discovered that certain elements would constantly emit small, energetic particles and rays; these energetic particles could penetrate matter
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Ernest Rutherford
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Gold Foil Experiment: discovered that there were three different kinds of emissions: alpha, beta, and gamma; discovered the nucleus and proton
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Soddy
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discovered that the same element could have atoms with different masses, which he called isotopes
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Mendeleev
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Periodic Table - ordered elements by atomic mass;
saw a repeating pattern of properties |
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Who gets credit for the law of conservation of mass?
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Antoine Lavoisier
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Who gets credit for the law of definite proportions/constant composition?
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Joseph Proust
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