Atomic Theory Project

Events

Democritus proposes existence of atoms.

400 B.C. - 300 B.C.

Antoine Lavoisier discovers Law of Conservation of Mass.

1782

John Dalton proposes first atomic theory of matter.

1803

Dimitri Mendeleev develops and publishes Periodic Table.

1869

Niels Bohr is born in Copenhagen, Denmark.

October 7, 1885

JJ Thomson discovers electron.

1897

Ernest Rutherford proposes positive nucleus and negative electron orbits.

1911

Niels Bohr is introduced to Rutherford.

1912

Niels Bohr creates own atomic model.

1913

Niels Bohr receives Nobel Prize.

1922

James Chadwick proves existence of neutrons.

1932

Niels Bohr dies in Copenhagen, Denmark.

November 18, 1962