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Atomic Theory Project
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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
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