The mass of a proton is approximately 2000 times that of an electron.
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The discovery of the proton, with a positive charge equal in magnitude but opposite in sign to that of the electron, further confirmed the existence of sub-atomic particles and provided insights into atomic structure.
The discovery of canal rays indicated the presence of positively charged particles in atoms, providing evidence for the existence of sub-atomic particles other than electrons.
Canal rays were positively charged radiations discovered by E. Goldstein in 1886 during gas discharge experiments.
J.J. Thomson identified the electron, a sub-atomic particle with a negative charge, thus demonstrating that atoms were not indivisible but composed of smaller, charged particles.