Who discovered electron?

J.J. Thomson

The correct answer is option 1.  J.J. Thomson.

The discovery of the electron is credited to 1. J.J. Thomson.

J.J. Thomson discovered the electron in 1897 through his experiments with cathode rays. His work led to the identification of the electron as a fundamental subatomic particle with a negative charge, contributing significantly to our understanding of atomic structure and the development of modern physics.