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He was a Greek philosophern (460 B.C. -370 B.C.) that discovered the existence of the atom. He believed that atoms were indivisible, but he did not have any experimental support.
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He was an English chemist and school teacher ( 1766-1844) He used atomic experimental methods to transform Democritus's ideas about atoms into the atomic theory.
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German physicist (1850-1930). He discovered anode rays and is sometimes credited with the discovery of the proton.
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English physicist (1856-1940). He performed experiments (cathode-ray tube) that involved passing electric currents through gasses under pressure. The cathode was made up of electrons. He discovered the "plum pudding model".
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He was a former student of Thompson (1871-1937). He tested the theory of atomic structure. He used a narrow beam of alpha particles directed at a very think sheet of foil. This was called the Gold-Foil experiment. This helped discover the atomic nucleus.
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He was a Danish physicist (1885-1962). He changed Rutherford's model. He proposed that an electron is found in only circular paths or the electrons orbit around the nucleus. Proposed that the electron orbit has a fixed energy which are called energy levels.
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Austrian physicist (1887-1961). Solved the equation that described the behavior of the electron in a hydrogen atom. The modern description of this model is called the quantum mechanical model.
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French physicist (1892-1987). He found that electrons can have waves and he suggested that all matter had wave properties.
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English physicist (1891-1974). He discovered the neutron and he directed alpha particles at nuclei
