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He gave his theory that atoms we made of fire, water, earth, and air
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Said that "atoms are the basic buldings blocks of matter"
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Atomic Theory
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He arranged the periodic table by the atomic mass for the first time
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He discovered electrons and explainedhis thoughts in
Treatise on the Motion of Vortex Rings -
Invented the Crooke's Tube
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He reported that alpha exsisted and beta rays in uranium radiation and indicated some of their properties.
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Said that electrons travel around the "shell" of an atom
