J.J. Thomson's cathode ray tube experiment demonstrated that

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1. Acathode rays are streams of negatively charged ions
2. Ball the mass of an atom is essentially in the nucleus
3. Cthe $e / m$ of electrons is much greater than the $e / m$ of protons
4. Dthe $e / m$ ratio of the cathode ray particles changes when a different gas is placed in the discharged tube