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Democritus
Proposed the atomic theory.
Born-460 BC -
Aristotle
Stated that all substances are made of 4 elements.
Born in Stagira in North Greece. -
John Dalton
Transformed ratio ideas on atoms into a theory.
Born - September 6,1766. -
J.J. Thompson
Discvered the electrons.
Born- December 18, 1856 -
Robert Millikan
Determined the cahrge and smallest amount of the electron.
Born-March 22, 1868 -
Ernest Rutherford
Born-August 30, 1871
Ernest Rutherford, 1st Baron Rutherford of Nelson. -
Neils Bohr
Proposed that an electron is found only in specific paths, or distance around the nucleus.
Born-October 7, 1885 -
Sir James Chadwick
Confirmed the existence of neutron in the sub-atomic particle.
Born-October 20, 1891