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When did jj thomson contribute to the atomic theory?

When did jj thomson contribute to the atomic theory?
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When did jj thomson contribute to the atomic theory?

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User Shiami
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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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