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12 Cards in this Set
- Front
- Back
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Democritus
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450 BC
Proposed that matter is made up of small indivisible particles called them atoms |
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Antoine-Laurent de Lavoisier
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1743~1794
Law of conversation of matter -matter is neither created nor destroyed |
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Joseph Louis Proust
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1754~1726
1799 Law of constant composition a given compound always contains the same elements in the same proportions by mass |
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John Dalton
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1766~1844
1839 Atomic theory of matter |
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Benjamin Franklin
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1706~1790
Lightning-key experiment found out that an object could have one of 2 charges (+) and (-) |
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Joseph John Thomson
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1856~1940
1896 Cathode ray experiment negative particles (called them electrons) |
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Robert A. Millikan
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1868~1953
1909 Oil drop experiment calculated charge and mass |
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Antoine César Becquerel
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1788~1878
Uranium on film emits radioactivity |
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Marie Skłodowska Curie
Pierre Curie |
1867~1934
1859~1906 isolated radioactive elements |
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Ernest Rutherford
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1871~1937
Radioactive element experiment Gold foil experiment atom is mostly empty space |
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Henry Gwyn-Jeffreys Moseley
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1887~1915
Unique atoms have unique # of protons |
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Max Karl Ernst Ludwig Planck
(such a long name :O) |
fundamental restriction on amounts of energy that an
1858~1947 object emits or absorbs (called quantum) Plancks constant |
