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Thomson was the first scientist to experimentally question the existence of positive and negative particles within the atom.
Added 7/30/2015 1:12:01 AM
This answer has been confirmed as correct and helpful.
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Andrew. [7/30/2015 1:16:24 AM]
5
J. J. Thomson took science to new heights with his 1897 discovery of the electron – the first subatomic particle. He also found the first evidence that stable elements can exist as isotopes and invented one of the most powerful tools in analytical chemistry – the mass spectrometer.
Added 12/28/2018 10:13:17 AM