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Democritus came up with the theory that the univerterse is made up of small particles called atoms that also make up all matter.
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He is nicknamed the father of chemistry becasue he was the first to come up with the law of conservation of mass but he also proposed the combustion theory.
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John Dalton stated that all matter is composed of very small particles called atoms. Dalton also said atoms cannot be created or destroyed.
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the law of consewrvation of mass states that matter can neither be creaated or destroyed.- Hermann von Helmholtz stated the law of conservation of mass.
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Dmitri arranged the first periodic table with only 63 elements on the table. He put them in order form increasing atomic weight
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J.J. discoverd that the mass of a charged particle was less than a hydrogen atom and he also created the pium pudding model
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the pum pudding model was made to show how random the electrons appeard inside the atom all of the atoms in the world have different places for there electrons.
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sir willam crookes discoverd the cathode ray tube. this discoverie later was used in making tvs
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Robert discoverd a way calculate the mass of a proton and electron.
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Ernest Ruthorford created an expeirement trying to proove that protons are found inside the nucleus and electron are found outside of the atoms nucleus.
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Ernest proposed that protons are found inside the nucleus and electron are found outside the nulcleus of the atom.
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Neils proposed that electrons travel in an stationary orbit around the atom
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Henry determined a way to measure the positive charges in the nucleus of an atom. this it the second concept for the atomic number.
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James discoverd the neutron witch led to fission and that led to the building of the atomic bomb.
