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His model was a sphere. It had no protons,neutrons, or electrons. He created the first atomic model helping people start to realize it .
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He started to name some of the elements like oxygen opposed the phlogiston theory. He also helped write some of the metric system and wrote the first bug list of elements.
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In 1803 John Dalton made his atomic theory stating, 1) All matter is made of atoms. Atoms are indivisible and indestructible. 3) Compounds are formed by a combination of two or more different kinds of atoms.
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He had the idea to list 63 of elements by their atomic mass into the periodic table. He made the lay out/set up of the periodic table.
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He contributed to the study of cathode rays. He discovered protons with experiments he had with cathode rays which would knock electrons of atoms and attracts them to a positively charged electrode.
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In 1897 Experiment to show that cathode rays were electrically charged. The cathode ray tube by which J.J. Thomson demonstrated that cathode rays could be deflected by a magnetic field, and that their negative charge was not a separate phenomenon.
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Was a physicist that came up with quantum theory of energy. His work was based off atomic and subatomic process.
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He had a experiment "oil drop" and this helped find out the charge of the electron which helps us better understand the atom.
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In 1911 rutherford had contributed field of radioactivity and nuclear physics. He discovered alpha and beta rays.
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The Bohr model of the atom in 1913 and what parts of the atom had what charge and how electrons orbited the atom.
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While looking at the Bohr model he use mathematical equations to find exactly were the electrons certain position is this is known as quantum mechanical.
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He was a physicist and justified the atomic number which came from his experiment of X-ray spectra.
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In 1931 Chadwick bombarded atoms of beryllium with alpha particles and received a strange form of radiation. The particles had a neutral change and and had the approximate mass of a proton.
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Added to quantum theory!
