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His atomic theory was his contribution to the structure of the atom. He said that everything is made of atoms
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His theory said that there were atoms of different size and mass to make different elements.
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He made the diagram of known elements
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He discovered protons and electrons in atoms
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He discovered that electrons are negatively charged
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He contributed to the understanding of atomic and subatomic processes
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He discovered the value of electron charges
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He found that JJ Thomson's theory was incorrect and that the atom was mostly empty space with electrons around a massive nucleus
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Proposed a theory for a hydrogen atom
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He made the quantum mechanical model of the atom
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He discovered that the core of the atom contained a neutron
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He made the theory of quantum mechanics
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