J. J. Thomson

J.J. Thomson

Dec 18, 1856

Born.

Robert Millikan

Mar 22, 1868

Birthday

Ernest Rutherford

Aug 30, 1871

Born.

James Chadwick

Oct 20, 1891

Born.

J.J. Thomson

Oct 1, 1897

In 1897, Thomson showed that cathode rays were composed of a previously unknown negatively charged particle, and thus is credited with the discovery and identification of the electron.

Robert Millikan

Oct 1, 1909

In 1909 Millikan began a series of experiments to determine the electric charge carried by a single electron.

Ernest Rutherford

Oct 1, 1911

In 1911, although he could not prove that it was positive or negative, he theorized that atoms have their charge concentrated in a very small nucleus, and thereby pioneered the Rutherford model of the atom, through his discovery and interpretation of Rutherford scattering in his gold foil experiment.

James Chadwick

Oct 1, 1932

In 1932, Chadwick pursued a line of research that led to his discovery of the neutron.

Ernest Ruterford

Oct 19, 1937

Died.

J.J. Thompson

Aug 30, 1940

Death.

Robert Millikan

Dec 19, 1953

Death

James Chadwick

Jul 24, 1974

Death