Joseph John Thomson

The Atomic Theory; Cathode Rays and Electrons

Ivy Fagan and Matthew Roberts

In 1896, while he was lecturing at Princeton (USA), he discovered electrons with cathode rays.

The Cathode Ray ^

Cathode rays are electrons viewed in vacuum tubes. Also known as electron tubes, or e-tubes.

In 1897, Thomson showed the rays charged with negatively charged particles, which he later named electrons.

Thomson discovered how to separate atoms using positive and negative rays.

Discovered positively charged spheres were orbited by electrons, now called atoms.

Found that there is a certain density for matter.

Found how to discharge electricity through gases.

Discovered electrons were places by electrostatic forces.

He was knighted in 1908.

He won the Nobel Prize in Physics in 1906.

He attended 2 colleges, Owens College, Manchester (1870), Trinity College Cambridge (1876) for physics and chemistry.

Was originally going to be an engineer, but became a physicist.

J.J. Thomson's Atomic Model (Plum Pudding) \/


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