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He explained that each element is made of small atoms and that different elements have atoms of different mass.
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He suggested that an atom is a positively-charged sphere with electrons embedded in it.
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He thought of atoms as constructed of a different series of cubes with electrons at each corner.
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He thought an atom had a large sphere in the center with a positive charge.
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He concluded that an atom is mostly empty space.
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He said electrons aren’t randomly located around the nucleus.
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He discover the neutron, a particle having about the same mass as the proton but with no electrical mass.
