jan 1, 1897 - J.J. THOMSON (1856-1940 CE) date of discovery (1897 CE) Discovered negatively charged particles (electrons) using cathode ray tubes and proposed the "plum pudding" model of the atom which consisted of a uniform sphere of positive charge with negative electrons embedded in the sphere. Even though Thomson’s atomic model was inaccurate and had a few drawbacks, Thomson's model is important because it introduced the notion that an atom consisted of charged particles and it provided the base for sev
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jan 1, 1897
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~ 128 years ago