What did george johnstone stoney discover?

George Johnstone Stoney is best known for his work in the late 19th century on the concept of the electron. In 1874, he proposed that electricity is composed of discrete units, which he referred to as "electrons," although the term was not widely adopted until later. Stoney's contributions laid the groundwork for understanding atomic structure and the nature of electric charge, influencing future developments in physics and chemistry. His pioneering ideas were crucial to the eventual discovery and acceptance of the electron as a fundamental particle.