JJ+Thomson+Hall

J.J. Thomson

[]  The Man

JJ Tohmson was a lecturer and physicist at Trinity college, Cabridge who achevied his greatist work by doing an original study of cathode rays which culminated in the discovery of the electron. [] 

In 1897 JJ Thomson demonstrated that cathode rays were actually units of electrical current made up of negatively charged particles of subatomic size. []

The Research

J.J. Thomson's research took place all over, but mainly at Trinity College in Cambridge, United Kingdom.

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Thomson used a glass tube with one end connected to a negative electrode, a positively charged electrode at the other end, and a tiny paddle wheel in the center. []

Thomson did research on atomic structure for years and one day on a trip to America after he had been doing research he delivered six lectures about electricity and matter. This led to him discovering important suggestions on the structure of the atom and the investigations on the conduction of electricity by gases which ultimately lead to him making his model.

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The Theory

The most important discovery that Thomson made was the discovery of the electron within an atom.

**Main points of his theory:**

**Errors wi​th his theory:** 1. Thomson’s model was not correct; the electrons were not just in a spherical cloud of positive matter. []
 * 1) There are “bodies much smaller than atoms”. Large value for charge to mass ratio. []
 * 2) An atom is a sphere of positive matter where electrons are placed by electrical forces. []
 * 3) The atom resembles a kind of “Plum Pudding” with the electrons being the raisins of the pudding/atom []

**Atomic structure:** []

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