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Democritus believed atoms were indivisible, atoms move through the empty space in matter, all atoms are homogeneous, indestructible, and indivisible
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He believed that all atoms were composed of the four basic elements, Earth, Fire, Wind, and Water
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Found out that in all chemical reactions, mass is not created or destroyed, it is conserved, this discovery led to the Law of Conservation of Mass
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He states that atoms cannot be created, nor can they be destroyed, this led to the law of conservation of mass
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He discovered the electron by working with charges in atoms
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He discovered the nucleus and that it is a small, + charged particle
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Measured charges on electrons in his famous oil drop experiment
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concluded that electrons orbit the nucleus in a concentric circle
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predicted the wave nature of electrons using equations
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Used mathematics to predict orbital locations of electrons, concluded there were more electrons in more dense areas of the atom
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Created the theory of quantum mechanics
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he found a new particle in the atom, the neutron and that it's charge was neutral
