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The greeks had a theory that said everything was made up of small particles.
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Datlon found out that atoms were solid spheres. This is kind of a theory because nobody can see an atom.
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He discovered the nucleus in an atom. He tested this hypothesis when he shot rays through a thin sheet of gold, they bounced back.
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Crooke made the C.R.T. Crooke made the C.R.T. that discovered positives and the negtives of an atom.
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He said that atoms had orbitz.