Atomic Theory Timeline
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Aristotle
Democritus
Antoine Lavoisier
John Dalton
Sir JJ Thompson
Robert Millikan
Sir Earnest Rutherford
Neils Bohr
Sir James Chadwick
Erwin Schrodinger
Wolfgang Pauli
Friedrich Hund
The Aufbau Principle
Albert Einstein
Otto Hahn, Lise Meitner, and Fritz Strassman
Robert Millikan
1909
American
Contribution
Determined the unit charge of electrons with his oil drop experiment allowing the calculation of the mass of electrons.
Confirmed Thomson's hypothesis.