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In 1782, a French chemist, Antoine Lavoisier (1743-1794), made measurements of chemical change in a sealed container. Development of the Modern Atomic.
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Atoms and Their Structure History of the Atom n n Original idea (400 B.C.) came from Democritus, a Greek philosopher n n Democritus expressed the belief.
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John Dalton (1766- 1844), an English schoolteacher and chemist, studied the results of experiments by many other scientists. Dalton’s Atomic Theory Atomic.