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He believed an atam was the smallest particle of matter. His atomic structure was just a sphere with no electrons, protons, or neutrons
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Lavoisier discovered that matter is conserved in a chemical reaction.
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He proposed that that all atoms of an element are identical and all the atoms that make up and element have the same mass.
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Created the first periodic table with the few elements there were
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Discovered canal rays which were positively charged ions that went through the cathode.
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Millikan discovered the charge of electrons with the oil drop apparatus. The charge of an electron is 1.602×10-19 coulomb.
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Created the atomic model in 1911, believed that electrons orbited around the nucleus like planets around the sun.
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Created the atomic battery by pulling electrons back into nuclear form with high voltage
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Bohr was Nobel prize winner and contributed to studies on the quantum theory. His atomic model shows the atom as small, positively charged nucleus surrounded by orbiting electrons.
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Created the quantum theory by discovering that a photon of light was carried by a quantum of energy
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Discovered a way to formulate the quantum theory
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Took Bohr’s atomic model further, instead created the quantum mechanical theory
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Chadwick discovered the neutron. Which he announced as an uncharged particle inside the nucleus.
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Thomason's model was known as the plum pudding model. His model shows the atom as positively charged, with negatively charged particles within it.
