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jan 1, 1887 - J.J. Thomson

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.

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atom timeline

ByShelby Swartzendruber
20 Dec 2019
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637

Date:

jan 1, 1887
Now
~ 139 years ago
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