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Believed there were four elements and four qualities, and they would align and be at rest.
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Democritus stated that all things are made up of atoms, which are indivisible and indestructable.
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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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Thomson used a cathode ray tube to inferr that there are small particles inside of every atom. This inference proved dalton's theory to be wrong. Particles can be divided
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Bacquerel discovered that rays emitted by uranium could not be detected by electric or magnetic fields.
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discovered radioactivity with Bacquerel
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Won the Nobel Prize for Physics in 1908 for his orbital theory of the atom through his discovery of Rutherford scattering off the nucleus with his gold foil experiment
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Millikan figured out how to get an electrons mass by doing a famous experiment with Thomson.
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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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Chadwick discovered the neutron.
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Each electron is thought of as a cloud, of negative charge, instead of one tiny negative particle. It is beleived in this model that electrons "occupy" all of the space in an atom at different levels or rings. An atom consists of energy levels, neutrons, and protons.
