What J J Thomson was famous for?

Answer 1

he was a British scientists that discovered negatively charged particles, electrons, inside the atom. he proposed a possible structure of the atom (atomic model) called the plum pudding. you can Google some images

Answer 2

J.J. Thomson is famous for his discovery of the electron, which he identified as a subatomic particle that is a fundamental constituent of matter. His research laid the foundation for the development of the modern atomic theory and his work in the field of physics ultimately led to the revolutionizing of our understanding of the structure of the atom.