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emocritus hypothesized that all matter is composed of tiny indestructible units, called atoms.
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Helped develop definition of an element
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Mass is conserved in a chemical reaction.
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He proposed an atomic theory with spherical solid atoms based upon measurable properties of mass.
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Dmitri Mendeleev created the periodic table
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He studied canal rays and found they were associated with the protons
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Probed atoms in a thin piece of gold foil
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descovered the phenomenon of radioactivity
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Created the famous equation E=mc 2
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He wrote The atomic number of an element is equal to the number of protons in the nucleus.
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he developed an explanation of atomic structure that underlies regularities of the periodic table of elements. his atomic model had atoms built up of successive orbital shells of electrons
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