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The greeks are the first to come up with the idea of the atom. It really means indivisible. They thought that it can't be split.
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he preformed experiment with various chemicals to show that they consist of elementary lumpy particals
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Thomson knew electrons were negative charge so he found the positive
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He discovered that each atom had a nuclues he shoot alpha particals in to a gold piece
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He figured out that electrons orbit the nucleus and there 5 diffrent orbits
