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Democratis discovered the atom and knew that it could not be broken down into anthing smaller than itself.
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John Dalton thought that atoms were smooth, hard balls that cannot be broken into anything smaller.
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Thomson's theory was that atoms are made of even smaller parts with electrons in 1897.
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Ruthfords theory eas that atoms were mostly empty space but with a positive charge at its centre.
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Bohris theory was that electrons are only found in some specific areas that orbit around the nucules.