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Aritotles believe that matter was made of "The Four Elements" http://www.timetoast.com/timelines/the-atom-timeline
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Democritus said that all matter is composed of atoms. http://www.timetoast.com/timelines/democritus-atom
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Dalton said that atoms are the smallest unit of matter and cannot be broken down, and he discovered the atomic theory. http://www.timetoast.com/timelines/the-atom-timeline
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Dalton discovered the electron using the cathode-ray tube. http://www.timetoast.com/timelines/the-atom-timeline
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Rutherford discovered the nucleus. http://www.timetoast.com/timelines/the-atom-timeline
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He made a model to show the number of electrons. http://www.timetoast.com/timelines/the-atom-timeline
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He made an equation for quantum wave mechanics. http://www.timetoast.com/timelines/the-atom-timeline
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He made the "uncertainty principle" which is the fact that one can't measure where a particle is or where it will go. http://www.timetoast.com/timelines/the-atom-timeline
