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Dalton noted oxygen and carbon mixed to make a compound.
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Thompson discovered the elecrton a negatively charged part of every atom.
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Nagoka proved the atom had a saturian rings around it.
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When Rutherford published his atomic theory describing the nucleus as having been surrounded by negative electrons.
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In 1913 he showed electrons traveled in circular orbits around the nucleus
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In 1932 Chadwick proved that the atomic nucleus contained a particle which had proposed more than a decade by Ernest Ruth ford.
