evolution of atomic theory

evolution of atomic theory - Evan Lema Chemistry 111...

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Evan Lema Due November 28th Chemistry 111 Discovery of Subatomic Particles The discovery of the basic atomic structure of atoms laid the foundation for a century full of discoveries involving the atom and insights into chemical reactions. The earliest atomic theory belonged to John Dalton, who in the early 1800’s suggested that each element was composed of single atoms. Dalton and others believed these atoms to be the smallest unit possible, until he was proved wrong in 1897 1 when J.J. Thompson discovered electrons by using a cathode ray tube. Thompson noticed that the cathode rays were being deflected by what he observed to be tiny negatively charged particles which later became known as electrons. This was a huge finding, proving that atoms were in fact not the smallest unit, but that there were subatomic particles. 2 3 Following his discovery of the electron, Thompson made his model of what he believed to be the structure of an atom in what came to be known as the plum pudding model. It consisted of randomly arranged electrons in a positive field that
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This essay was uploaded on 04/22/2008 for the course CHEM 111 taught by Professor Kipp during the Spring '07 term at Suffolk.

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evolution of atomic theory - Evan Lema Chemistry 111...

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