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Democritus in 450BC coins the term "atom" which means uncuttable. Describes the smallest piece of matter.
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Antoine Lavoisior defined the element as something that could not be broken down further by the methods of chemistry.
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Dalton proposes that elements are made of atoms of a single type.
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Thomson proposes atoms are made of protons neutrons and electrons all mixed together. Termed "plum pudding model"
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Ernest Rutherford fires alpha particles at gold foil. Concludes that atoms have postively charged nucleus' with orbiting electrons
