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Democritus said that all things are made up of atoms which are indivisible and indestructible.
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Aristotle believed everything was made up of four specific elements. Earth, water, fire, and air.
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Dalton's theory was that every element was made up of different atoms, specifically with different masses.
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JJ Thomson conducted an experiment with a cathode ray tube, not uncommon at the time.
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Bacquerel discovered that the rays from uranium are different from X-Rays. They could not be detected by electric or magnetic fields.
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They won a nobel prize for the discovery of radioactivity with Bacquerel.
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Did the "Oil Drop Expirement"
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Rutherford tested Thomson's plum pudding model.
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Bohr applied the quantum theory to Rutherford's atomic structure by assuming that electrons travel in stationary orbits. This led to the calculation of energy levels.
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The quantum model is a probability area an electron may be located in.
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Chadwick discovered the nuetron.
