Describe the contributions of the following scientists to our knowledge of atomic structure: J. J. Thomson, R. A. Millikan, Ernest Rutherford, James Chadwick.
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J.J Thomson: Sir Joseph John "J. J." Thomson (18 December 1856-30 August 1940) was a British physicist who discovered an .
R.A Millikan: Born March 22, 1868 in Morrison, Ill.And he determined .