Thomson Joseph John

Thomson

, Sir Joseph John Known as "J.J." 1856-1940.
British physicist who discovered the electron. He won a 1906 Nobel Prize for his investigations on the electrical conductivity of gases.

Thom·son

(tŏm′sən), Sir Joseph John 1856-1940.
British physicist who discovered the electron. While experimenting with cathode rays, he deduced that the particles he observed were smaller than an atom. Thomson went on to study the ability of gases to conduct electricity.