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Democritus theorizes that everything in the universe is composed of tiny particles named atoms
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States that mass is neither created nor destroyed
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Discovered oxygen molecule and came up with Law of Constant Composition
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Proust stated that a chemical compound has the same amount proportions of elements
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Published the law of definite proportion and this helped Dalton to propose his atomic theory
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Provided explanations for concepts and ideas
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Made first periodic table based on atomic mass
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Discovered atoms have positive charges
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Creates Plum Pudding Model and discovers electron
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Used to find charge to mass ratio of an atom
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Considered that the inside of an atom was like raisin bread
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Dicovered atoms were divisible
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Discovered unit of charge in an electron, positively charged atoms and the mass of an electron
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Used by Ernest Rutherford to figure out what nucleus really looked like and disproved Plum Pudding Model
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Better model of atom because people had the components but didnt know how they fit
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Discovered that atons have central positive nucleus surrounded by negative electrons
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Explain structure and actions of complex atoms
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Led to possible calculation of energy level and that light emission is from electrons moving in lower level
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Rearranged periodic table based on atomic number not atomic mass and new periodic table was better and allowed for progression of atoms
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Learned how to find probability of where an electron is located in an orbital
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Explains the behavior of atoms in the atomic and subatomic realms
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Discovered nuetron and led to discovery of fission and atom bomb
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Explained nuclear fission and modeled the nucleus