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Democrotis would be a Greek philosopher. He would start to develop his theory around 400 B.C.

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He suggested that all matter as formed of different types of tiny discrete particles and that the properties also determined the properties of matter. He wouldn’t be able to prove his theory as such means didn’t exist then.

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He would make a theory that material bodies are made up of indivisible small atoms

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Near the beginning of the nineteenth century experiments with gasses became possible. This led John to start to propose a theory of the atom in 1803

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He would experiment with gases. This led to him to discover that oxygen combined with either one or two volumes of nitric oxide in closed vessels over water.

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Dultan would discover that the total pressure of a mixture of gasses is the sum of the contributions of the components of the mixture.

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Medeleev was a Russian chemist. On February 17, 1869, he would categorize the periodic table.

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Medeleev would have a dream this would cause him to get up and jolt down the chemical elements. He would put them in order by atomic weights.

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Medeleev would discover Periodic law. He would discover this while arranging the periodic table.

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While returning from AMerica he would make an study of cathode rays leading to the discovery of the electron on Friday, April 30, 1897.

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Thomson would experiment with cathode ray tubes. This showed him that all atoms have a tiny negative charged subatomic  particles or electrons

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Thomson would discover electrons while experimenting with cathode ray tubes

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Rutherford, a physicist from New Zealand, would develop a  atomic model in 1911.

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Rutherford used something called the gold foil experiment. A alpha particles beam is aimed at gold foil. Some of the particles passed the foil and a few scattered backwards

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He would discover that there are two types of radiation coming from uranium. These two types were alpha and beta particles.

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Bohr would propose his theory in 1913. The theory was for the hydrogen atom

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Bohr used the nuclear fission. Fission is the process of splitting the nucleus of a atom.

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Bohr would discover that electrons moved around a nucleus but in certain orbits. HE also would discover that if an electron was to jump to a lower energy orbit the difference would send out radiation.

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Schrodinger would make his great discovery during the first half  of 1926

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Schrodinger’s experiment would become known as Schrödinger’s cat. In this experiment a cat is in a box with poison. The vial of poison breaks if an atom decays within the box.

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He would discover wave equation.It was the result of his dissatisfaction with Bohr’s theory.

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In February 1927 He would make huge steps in Quantum theory

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He would consider trying to measure the position of an electron with gamma ray microscope.

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He would discover the theory of quantum mechanics . This theory would help in the discovery of allotropic forms of hydrogen

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Chadwick would discover the neutron in 1932. This would be fundamental in the nuclear science.

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Chadwick would bombard beryllium with alpha particles from the natural radioactive decay of polonium.

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Chadwick would make the fundamental discovery of neutrons.