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Aristotle beleived there in an atom there were four elements and four qualities, and that they would be in the same place they began when at rest.
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Democritus believed atoms were hard and small particles followed by one substance and in one shape. He thought they were always moving and combined with each other.
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Boyle believed that gasses are made up of tiny particles that group together.
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Lavoisier created the idea of having on single -common language for all of science to use.
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Dalton believe that the reason elements combined was because all elements are made up of atoms.
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Thomson used a cathode ray tube to discover that there are small particles inside of every atom.
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Nagoaka developed an early but incorrect model of the atom.
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Rutherford create an expirament, he shot a positively charged beam of particles through a sheet of gold foil.
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Bohr suggested that electrons travel around the nucleus in definite paths.
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This is the current day model of an atom and is based on a theory of quantum mechanics. Each electron is a cloud, of negative charge, instead of one tiny negative particle. It is believed in this model that electrons fill all of the space in an atom at different levels.