Group 3 best timeline

John Dalton is Born

Sep 6, 1766

Borin in Cumberland, England.

Dalton Published Work

Nov 29, 1802

Publishes "Memoirs"
Research of the Atomic Theory
States that matter is composed of discrete units called atoms, as opposed to the obsolete notion that matter could be divided into any arbitrarily small quantity.

John Dalton Dies

Jul 27, 1844

Dies in Manchester, England at age 78 of paralysis

Joseph John (J.J) Thomson

Dec 18, 1856

Born in Cheetham Hill.

Karl Ernst Ludwig Planck was Born

Apr 23, 1858

Born in Kiel, Germany

Ernest Rutherford

Aug 30, 1871

Born in Nelson, New Zealand

Niels Bohr

Oct 7, 1885

Born in Copenhagen, Denmark

Robert Millikan

Mar 22, 1886

Born in Morrison, Illinois

James Chadwick

Oct 20, 1891

Born in Cheshire, England.

Thomson's Discovery

Apr 30, 1897

Thomson announced hid discovery of the electron in the Royal Institution only through original study of cathode rays and their electric discharge.

Energy Quanta

Nov 29, 1897

Published in the Annalen der Physik. His work is summarized in two books Thermodynamik (Thermodynamics)

Energy Quanta

Nov 29, 1906

Published Theorie der Wärmestrahlung (Theory of heat radiat ion)

Millikan Discovery

Sep 27, 1910

Charged carried by electron, using elegant "falling-drop method." He also proved that this quanity was a constant for all electrons.

Rutherfords Discovery

Oct 30, 1911

Does gold foil experiment.
He postulated that atoms have their positive charge concentrated in a very small nucleus.
Makes Rutherford model.

Bohr Discovery

Nov 30, 1913

Went to University of Copenhagen in 1903-1911
While there, he came up with the model of the atoms and proposed the model in 1913
Model showed protons and neutrons and various energy states of the surrounding electrons

Chadwick's Discovery

Mar 17, 1932

Chadwick's discovered and proved the existence of neutrons.
He helped make atomic disintegration that need not over come any electric barrier and is capable of penetraing and spliting the nuclei of the even the heaviest elements.
Later helped make the atomic bomb.

Ernest Rutherford

Oct 19, 1937

Died in Cambridge. He died from a hernia.

Thomson Dies

Aug 30, 1940

Cambridge, UK

Karl Ernst Ludwig Planck died

Oct 4, 1947

He died at Göttingen

Millikan Dies

Dec 19, 1953

Dies in San Marino, California

Bohr Dies

Nov 18, 1962

Died in Copenhagen, Demark

James Chadwick Dies

Jul 24, 1974

Cambridge, Cambridgeshire, England