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Democritus was the first scientist to create a model of the atom. He created the name atom from the Greek word atomos, which means uncuttable. 400BC
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Isaac Newton proposed that all matter was a small solid mass in motion.
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John Dalton agreed with Democritus’ model but added that all matter was made up of atoms. His theory latter help advanced the theory of an atom.
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Robert Millikan performed an oil drop experiment that proved a state the J.J. Thompson made that electrons were 1000x smaller than the atom
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Ernest Rutherford discovered the existence of the nucleus
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H.G.J Moseley discovered that the number of protons in an elements determines the atomic number
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Erwin Schrödinger generated a mathematical model for the distribution of electrons and protons in an atom
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J.J. Thompson was the first scientist to create a model that was not a solid ball. His model was called the plum pudding model.