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13 Cards in this Set
- Front
- Back
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Democritus
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atoms are indivisible
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Dalton
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a. an element is made up of indivisible atoms that have the same chemical composition.
b. atoms of different elements have different properties c. compounds are formed when atoms of 2 or > elements combine. The relative numbers of atoms of each kind are definite and constant. d. chemical reactions occur when atoms are separated, joined or rearranged. |
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Thomson
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a. "Plum Pudding Model"
b. Cathode Ray Tube (CRT) c. Mass to charge ratio of the electron by measuring the degree of deflections of cathode rays by electrical fields of different magnitudes. |
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Millikan
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a. "Oil Drop Experiment"
b. Calculated mass and charge of electron |
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Goldstein
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protons
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Chadwick
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neutron
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Rutherford
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a. "Gold foil experiement"
b. nucleus is positive and dense |
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Becquerel
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radio activity
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Marie Curie
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worked with Becquerel (radiation expressed in Curie)
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Bohr
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"Planetary Model"
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Planck, Einstein, Schrodinger
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Quantum Mechanical Model
(modern theory) electro-cloud wall |
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Mendeleer
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Periodic table arranged according to mass number
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Moseley
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atomic number
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