ATOMIC THEORY TIMELINE

J. J. Thomson

• Joseph John Thomson was born on December 1856 in Cheetham Hill, near Manchester, UK.
• He attended Owens College in Manchester.
• He then married one of his students, Rose Paget in 1892.
• Rose and J.J. had two children - a son and a daughter. His son won a Nobel Peace Prize for Physics.
• J.J. Thomson died on August 30, 1940 in Cambridge.

J.J. experiments with gases. His 1897 experiment revealed that electrons were a part of atoms and showed that they were able to measure voltage.

Plum Pudding Model

The atomic model invented by J.J. Thomson was composed of electrons surrounded by a soup of positive charge to balance the electrons' negative charge.