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He developed the concept of the 'atom'.
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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 even smaller things. Electrons orbit in circles within a sphere of positive charge.
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He showed that atoms have (+) 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 or shells.
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Described electrons as waves with their probable location viewed as a cloud and introduced a mathematical model of the atom.
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Discovered the existence of neutrons, the neutral particle that shares the nucleus with the positively charged proton.
