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8 Cards in this Set
- Front
- Back
Aristotle |
Aristotle believed that all matter was composed of fire, earth, water and air |
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Democritus |
Proposed the idea of indivisible particles called atoms |
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Robert BOYLE |
Gases are made up of tiny particles that group together to make different substances |
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Antoine LAVOISER |
law of conservation of mass |
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John Dalton |
Imagined all atoms were small spheres Model he used to explain matter: -Small, indivisible particles called atoms -All the atoms of an element are identical in properties such as size and mass -Atoms of different elements have different properties -Atoms of different elements can combine in specific fixed ratios to form new substances |
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J.J Thomson |
Discovered electrons |
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Ernest Rutherford |
Discovered the nucleus |
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Neils Bohr |
Proposed electrons surrounded the nucleus in specific energy levels |