Atomic Theory Timeline

Antoine Lavoisier

Feb 1, 1775

recognized oxygen as an element, and coined its name which comes from a Greek word that means acid-former.

John Dalton

Sep 1, 1803

James Maxwell

Jan 1, 1873

best known for his research in electromagnetic radiation, which unites the sciences of electricity, magnetism and optics.

JJ Thompson

Feb 10, 1897

Studied "canal rays" and found they were associated with the proton H + .

Marie Curie

Jul 1, 1898

was a physicist and chemist famous for her pioneering research on radioactivity

Ernst Rutherford

Feb 1, 1911

He discovered the nucleus and the gold foil experience.

Henery Moseley

Jan 1, 1913

published the results of his measurements of the wavelengths of the X-ray spectral lines of a number of elements which showed that the ordering of the wavelengths of the X-ray emissions of the elements coincided with the ordering of the elements by atomic number

Neils Bohr

Jul 24, 1913

Bohr said that electrons traveled in circular orbits around the nucleus, yes their is a difference between an orbit and an orbital.

Erwin Schrodinger

Feb 1, 1930

Viewed electrons as continuous clouds and introduced "wave mechanics" as a mathematical model of the atom.

James Chadwick

Feb 10, 1932

Using alpha particles discovered a neutral atomic particle with a mass close to a proton. Thus was discovered the neutron.

Aristotle

Feb 9, 1974

Before Christ.

Werner Heisenberg

Feb 10, 2012

Described atoms by means of formula connected to the frequencies of spectral lines. Proposed Principle of Indeterminancy - you can not know both the position and velocity of a particle.