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6 Cards in this Set
- Front
- Back
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Describe Democritus' Atomic Model. |
Small, solid sphere (like a marble or billard ball) Smaller than a grain of salt |
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What did Aristotle and Plato believe about matter? |
They believed that matter was composed of earth, fire, air and water. All elements are composed of combinations of the four |
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What were the five points of Dalton's theory? |
1) All matter is composed of atoms 2) Atoms are indivisible and indestructible 3) All atoms of the same element have the same mass and properties 4) Compounds are formed by a combination of two or more different kinds of atoms 5) A chemical reaction is a rearrangement of atoms |
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What did J.J. Thomson discover? |
He discovered the electron during his experiment with a cathode-ray tube |
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What was the name of Thomson's atomic model? Why was it named that? |
It was named the Plum Pudding Model because the electrons were scattered about the atom like raisins in plum pudding |
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What did Ernest Rutherford discover? |
He discovered the nucleus during his gold=foil experiment and proposed his planetary atomic model |
