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Democritus proposed that everything was made of invisible particles he called atomos which could not be divided
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By Steven Nesfeder
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Created the most basic form of the Periodic Table by theorizing that elements were made of earth, wind, fire, and water and succeeded in obtaining some elements
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Stated that opposite charges attracted each other and similar charges repelled eachother
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Lavioser proposed the law of conservation of mass and proved that matter could not be created or destroyed
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Proposed the law of multiple proportions
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Organized elements by atomic mass (creating a fleshed out basis for the modern Periodic Table) and correctly predicted elements not yet discovered
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Concluded that cathode rays are negatively charged
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Studied radioactive elements and discovered that atoms break down and release radiation when exposed to radioactive materials
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Proposed the quantum theory of energy
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Created a "plum pudding" atomic model
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Created the Special Theory of Relativity
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Discovered the quantity of charge in an electron
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Proved that atoms have a very small but extremely dense center, or nucleus
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Created the planetary atomic model
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Created the uncertainty principle and quantum mechanics theory
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Published the probability function and created the electron cloud atomic model
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Stated that the nucleus of an atom is made of protons and neutrons and electrons orbit the nucleus. He also stated that neutrons have no charge and have the same mass as protons.