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440BCE. Democritus said if you cut something to the smallist partical an atom can not be cut anymore. Aristotle disagreed and than is turned out that Democritus was right.
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Daltons stated Atoms of the same element are exactly alike. Also atoms of different elements are different. Daltons looks like a pool ball.
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Thompson said that in Daltons theory had a mistake. Thomson discovered that unlike what Dalton said there were particals inside of the atom. Thomson used a cothode-ray to find electrons. Thomson's atom looked like a blob with electrons stuck on the out side
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Rutherfords experiment Rutherford conducted a experiment with a beam shot at a thin peice of he gold.Behind the gold was a special coating. When the beam hit the coating it glowed.
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Rutherford performed a experiment that alowed him to discover that almost all of the mass of the atom is concentrated in the center witch is the e nucleus.
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Bohr's atom video revised Rurtherford's atom. Bohr's atom was the electron revolving around the nucleus without losing energy also known as the planetary model.
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There website with factsThey say electrons can not travel in definite paths around the nuceus. And electron clouds are were your mostlikley going to find electrons.
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