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everything in the world was made up of tiny particles surrounded by empty space
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atoms are tiny, indestructible particles, with no internal structure
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atoms are uniform compact spheres filled with negatively charged electrons
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found the mass and charge of the electron through his oil drop experiment
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atoms consist largely of empty space with just a few electrons while most of the mass was concentrated in the center of the nucleus.
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electrons orbit the nucleus at fixed energies and distances
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It was impossible to determine both the exact position and speed of an electron as it moved around an atom
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confirmed the existence of neutrons, which have no charge
