Scientists Timeline

Significant Events

Joseph Priestley: discovered oxygen, carbon monoxide, and nitrogen dioxide

1774

Antoine Lavoisier: law of conservation of mass; father of modern chemistry

1789

Alessandro Volta: created electrochemical cell and batteries

1800

Michael Faraday: discovered electricity and electrochemistry

1831

Louis Pasteur: pasteurization process

1862

Alfred Nobel: dynamite, Nobel prize

1863

Henri Becquerel: discovered radioactivity

1886

Guglielmo Marconi: created the radio

1901

Sir Fredric Banting: created isolated insulin

1922

Philo Farnsworth: created the TV

1926

Wallace Carothers: neoprene and nylon

1931

Marie Curie: radioactivity

1934

Leo Szilard: discovered nuclear chain reactions and atomic bomb

1934

Kary Mullis: polymerase chain reaction

1983

Modern Atomic Theory

John Dalton: proposed an "Atomic Theory" with spherical solid atoms

1803

E. Goldstein: Studied "canal rays" which had electrical and magnetic properties

1886

JJ Thompson: experimentally determinded the charge to mass ratio of an electron.

1897

electron = 1.759 x 10 8 coulombs/gram.

Max Planck: used the idea of quanta (discrete units of energy) to explain matter

1900

Albert Einstein: created the equation E=mc2

1905

R.A. Millikan: experimented and determined the charge and mass of an electron.

1909

Charge=1.602 x 10 -19 Mass = 9.11 x 10 -28 gram

E. Rutherford: found that the nucleus was dense, small and positively charged

1911

H.G.J. Moseley: determined the charges on the nuclei of most atoms.

1914

Niels Bohr: determined that atoms are built up of orbital shells of electrons.

1922

de Broglie:Discovered that electrons had a dual nature.

1923

Dual Nature is similar to both particles and waves

Heisenberg: Described atoms as connected to the frequencies of spectral lines.

1927

Schrodinger: introduced "wave mechanics" as a mathematical model of the atom.

1930

James Chadwick: discovered a neutral atomic particle known as the neutron.

1932

Historical Events

Discovery of the Americans

1492

Reformation of the Catholic Church

1527

Galileo convicted of heresy

1633

Declaration of Independence

1776

Civil War

1861

First transcontinental railroad in US

1869

Assassination of Archduke Ferdinand

1914

Bolshevik revolution

1917

Treaty of Versailles

1919

Bombing of Pearl Harbor

1941

First cellular phone

1946

Initial concept for world wide web

1969