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The Greeks came up with atomos, which means that things were so small you couldnt cut them anymore.
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Dolton expanded the Greek idea about atoms. He came up atoms looked like soild spheres.
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Crooke made the CRT (Cathod Ray Tube), which showed that
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Thomson discovered electrons, (pulm pudding). He also discovered the mass of electron.
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Rutherford did the experment, where he shot bullets into a thin gold sheet, most of them went right through, but some bounced right back, thats when he discovered the necless.
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The Greeks, came up with atomos, which means there so small they can tbe cut up anymore.
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Bohr discovered that the electrons are in obrits, or engery levels around the neculess. Electrons are in unpredictable motions, its called the electron cloud theroy.