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He created a law called The Law of Constant Composition that states that a pure compound has elements that will combine in definite porportions of masses.
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He pictured that atoms were tiny spherical particles that can not be destroyed. In his picture the particle did not have an internal structure.
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He discovered the radioactivity by accident. One of his partners on this experiment was Marie Curie.
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He was the first to discover the electron, which led to his plum-pudding model. This model was a positive charged sphere with electrons imbedded into it.
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He created a newer theory of radiation, where the energy is released is equal to his constant multipled by the wavelength.
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In his experiment he found out that most of the area in an atom was empty space. Discovered that almost all mass was located in the nucleus.
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In his model of the atom, the electrons moved in circular paths around the nucleus. Each level has a fixed distance from the center.
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He found out the quantity of charge an electron has using J.J. Thomson's charge to mass ratio. The values that he found are very close to the values that are accepted today.
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He proposed that electrons particles have similar charateristics to waves and with in a couple of years there was experimental evidence to support it.
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He stated that in quantum mechanics we can not know the velocity and position of an electron at the same time.
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In his work he developed mathmatical equations that described the path of electrons which led to the electron cloud model.
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He was the first to explain the existence of neutrons in the nucleus. The neutrons he discovered have a neutral charge.
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He was against Democritus's ideas stating that the earth would fall apart if Democritus was right. He believed the earth consisted of dryness, wetness, heat and cold.
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His theory was that everything was made up of atoms. He was the first to state that they were invisible and indestrutible but there was a lacking of experimental support.
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