Why did J. J. Thomson reason that electrons must be a part of the atoms of all elements?
An electron is 2000 times lighter than a hydrogen atom.
Charge-to-mass ratio of electrons was the same, regardless of the gas used.
Cathode rays are negatively-charged particles.
Cathode rays can be deflected by magnets.
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Why did J. J. Thomson reason that electrons must be a part of the atoms of all elements?
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