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He developed the concept of atoms
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He created the very first atomic theory. Each element is made up of particles called atoms
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He showed that the atom was made of most smaller things. Electrons orbiting circles within a sphere of positive charge
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He showed that atoms have positive particles in the center and are mostly empty space. He discovered protons and nucleus.
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He proposed that electrons move around the nucleus in specific layers layers or shells
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Described electrons as waves with their probable location viewed as a cloud and introduced a mathematical model of a atom.
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Discovered the existence of neutrons, the neutrals particle that shares the nucleus with the positively charged proton.
