Michael Faraday, an experimental scientist in the 18th century... 

Faraday's experiment, called electrolysis, led to the discovery of the electron.  By passing an electric current through a chemical compound containing metal (tin chloride), he realized that a chemical reaction occurs in it.

One of his most notable experiments, known as electrolysis, played a crucial role in the discovery of the electron.

At that time, they were looking for electrons and neutrons and such things
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