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.
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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.
Through experiments involving the behavior of charged objects, scientists inferred that atoms must contain charged particles. This understanding was further solidified by the discovery of sub-atomic particles like electrons and protons.