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7 Cards in this Set
- Front
- Back
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Aristotle
350 BC |
-matter is composed of earth, wind, fire, and water.
-there is no such thing as an atom |
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Democritus
400 BC |
-tiny solid homogeneous particles that are incuttable
-credited with the origional atomic model |
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Dalton
1803 |
-experimented with gases
-all matter is made of atoms -atoms of an element are identical -atoms pf different elements combine in contant ratio to form compounds -Law of Conservation of Mass |
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Thomson
1897 |
-plum pudding model or chocolate chip model
-electrons are embedded in a positively charged sphere |
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Rutherford
1911 |
-gold foil experiment
-central positively charged nucleus -electrons in empty space around the nucleus -almost all of the mass is in the nucleus |
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Bohr
1922 |
-nucleus contains both positive and neutral charges or particles
-electrons are in fixed orbits around the nucleus -Bohr Model |
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Shrodinger
1926 |
-electron cloud
-nucleus with protons and neutrons -electroms om a cloud around the nucleus with no fixed orbit |
