The Atom

Democritous

460

Atoms-Democritus discovered that all mater consists of atoms, atoms are indestructible, atoms are eternal and are always moving, and atoms are homogenous. He lived from 460 bc to 370 bc.

John Dalton

Sep 6, 1844

Atom-Dalton found that a given element has a certain shape and size and that compounds are made of two or more elements. He lived from september 6 1776 to july 27 1844.

Ernest Rutherford

Oct 19, 1937

Atom-Rutherford used gold foil to find out that atoms are made of mostly empty space. He lived from August 30, 1871 to October 19, 1937.

J. J. Thomson

Aug 30, 1940

Atom-Thomson discovered electrons using a cathode ray tube. He proposed plum pudding model. He was born december 18 1856 and died on august 30 1940

Max Planck

Oct 4, 1947

Atom-Planck started the idea of the quantum theory. He was born in april 23 1858 and died on october 4 1947.

Erwin Schrodinger

Jan 4, 1961

Atom-Schrodinger made the Schrödinger's wave. He was born august 12 1887 and died on january 4 1961.

Neils Bohr

Nov 18, 1963

Atom-Bohr found out that the atom has many different shells. He was born october 71885 and died on november 18 1963

James Chadwick

Jul 24, 1974

Atom-Chadwick discovered the nuetron. He lived from october 20 1891 and died in july 24 1974.

Francis Aston

Nov 20, 1975

Atom-Aston invented the mass spectograph. He was born september 1 1877 and died on november 20 1975

Werner Hiesenberg

Feb 1, 1976

Atom-Hiesenberg inveented the Heisenberg Uncertainty Principle. He was born in 5-Dec-1901 and died on 1-Feb-1976.

Paul Dirac

Oct 20, 1984

Atom-Dirac invented the priciples of quantim mechanics. He was born on 8-Aug-1902 and died on 20-Oct-1984.

Louis de Broglie

Mar 19, 1987

Atom-Broglie discovered the wave nature of electrons. Her was born in 15-Aug-1892 and died in 19-Mar-1987.