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Democritus's contribution was that he hypothesized that the atom could not be destroyed or altered in any way and that there are an infinite number of atoms.
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His contribution to the Atomic Theory was that he came up with the Law of Conservation. The Law of Conservation simply states that matter cannot be made or destroyed.
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His contribution to the atomic theory was his theory that the elements were different from each other as a factor of the mass of their atoms(atomic mass)
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J.J. Thomson contribution was that he discovered the subatomic particle known as the electron.
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Marie's Contributions to the research of radiation significantly helped the atomic theory
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He is known as the father of modern physics for his discoveries. He came up with a mathematical formula to predict the size of molecules and atoms. And he contributed much more after that.
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He created the Rutherford Model: Atoms contain a small charged nucleus surrounded by empty space and are circled by tiny electrons.
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He discovered the electron which was of course a major contribution to the atomic theory.
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Best known for creating the quantum theory of energy
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He helped express the measurement of the charge of an electron.
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He modified the bohr atom model. He used mathematical equations to explain the possibilities of finding an electron in a certain position(The Quantum Mechanical Model of the Atom).
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He is known for the creation of quantum mechanics
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He is best known for his contribution to the quantum theory.
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He discovered the neutron. The combination of beryllium atoms and alpha particles resulted in a new radiation which was made up of particles with a neutral electric charge.
