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jan 1, 1897 - J.J. Thompson (1897)

Description:

In 1897, J.J. Thomson discovered the electron by experimenting with a Crookes, or cathode ray, tube. He demonstrated that cathode rays were negatively charged. In addition, he also studied positively charged particles in neon gas. Thomson realized that the accepted model of an atom did not account for negatively or positively charged particles. Therefore, he proposed a model of the atom which he likened to plum pudding.

Added to timeline:

13 Sep 2017
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History of the Atomic Theory

Date:

jan 1, 1897
Now
~ 121 years ago
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