Scientist Facts
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| 440 B.C. | Democritus
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| Atoms are uncuttable | Democritus
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| "Atomos" meaning indivisible | Democritus
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| 1803 | Dalton
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| Atoms of different elements are different | Dalton
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| Conducted experiment combining elements; elements combine in proportions | Dalton
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| All substances are made of atoms | Dalton
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| Atoms of the same element are exactly alike | Dalton
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| 1897 | Thomson
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| Small, negatively charged particles inside the atom | Thomson
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| Cathode Ray Tube Experiment | Thomson
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| Plum Pudding Model | Thomson
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| 1911 | Rutherford
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| Small, dense positively charged nucleus | Rutherford
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| Most of an atom's mass is in the nucleus | Rutherford
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| Atoms contain mostly empty space | Rutherford
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| Electrons travel around nucleus like planets | Rutherford
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| Gold Foil Experiment | Rutherford
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| 1913 | Bohr
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| Electrons jump between levels from path to path | Bohr
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| Electrons travel in definite paths | Bohr
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| Electron paths are called levels | Bohr
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| Twentieth century | Heisenberg and Schrodinger
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| Electrons are found in electron clouds not paths | Heisenberg and Schrodinger
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| Electron paths cannot be predicted | Heisenberg and Schrodinger
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| Atoms cannot be created, divided, or destroyed | Dalton
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| Levels are certain distances from the nucleus | Bohr
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| No paths are located between levels | Bohr
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| Inside the nucleus is the protons | Heisenberg and Schrodinger
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