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In 400 bc, Democritus had the theory that the universe had 2 elements, atoms and the void they move in. His structure was a small ball of matter.
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He believed they were solid atoms.
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Found electrons in his Atom altering the previous models. This became the Plum Pudding Model because he proposed an atom with positive "pudding" with negatively charged "plums"
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He expanded the way we look at the atom with the Atomic Theory. This was used to explain hot, glowing matter.
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Known for his Oil Drop experiment, Millikan tested and determined the mass and charge of the atom.
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Rutherford discovered through his Gold Foil Experiment, that there were negatively charged which was different from the nucleus of the atom.
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His atom had orbitals which built up with the energy.
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Looked at atoms as a formula, determining that you cannot know the velocity and position of the particle simoultaniously.
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He introduced Wave Mechanics as a mathematical way to see the atom. He proposed the Quantum Mechancial Model.
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He discovered the neutron during his experiments leading up to his new atomic model.
