J.J+Thomson

__**J,J. Thomson Biography**__ Joseph John Thomson was born on December 18, 1856. He enrolled at Owens College, Manchester, in 1870, and in 1876 entered Trinity College, Cambridge. In 1884, Thomson became Cavendish Professor of Physics. He also determined the charge to mass ratio of electrons. In 1985, he discovered that cathode rays consisted of negatively charged particles of subatomic size. These became known as the electron. In 1906 he won the Nobel Peace Prize for his conduction of electricity by gases. He came up with the theory that all matter consisted of negatively particles surrounded by positively charged particles, and that these charges neutralized each other. __**Model**__ Thomson created the "Plum Pudding Model." In this model the atom is composed of electrons, which were surrounded by positive charge to balance the negative charge. So the negative charge was the "plum" surrounded by the positive charge the "pudding." __**Pros and Cons**__ Thomson's model consisted of electrons, but they weren't orbiting and neutrons and protons do not exist.

Worked on by Tori Raderstorf