feb 1, 1897 - J.J. Thompson's Discovery 1897
J.J. Thompson experienced with the materials or powers inside of an atom.
He bent a cathode tube and noticed it would bend towards a positive charge and away from a negative charge in part of the experiment.
He figured that atoms have negative particles inside of them called electrons.
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"History of the Atom" - Physical Science - Shahroze M.
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