What is the contribute jj thomoson?

J.J. Thomson is best known for his discovery of the electron in 1897, which fundamentally changed the understanding of atomic structure. He conducted experiments using cathode rays, leading to the conclusion that these rays were composed of negatively charged particles much smaller than atoms. This discovery contributed to the development of the field of atomic physics and paved the way for later models of the atom, including the plum pudding model. Thomson's work earned him the Nobel Prize in Physics in 1906.