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101
Thales - 600 BC
He thought everyhting was made out of water. -
101
Democritus - 460-370 BC
The was the first one to think there was an atom. -
101
Aristotle - 384-322 BC
He did not believe in the atomic theory. -
Isaac Newton - 1704
He thought atoms were tiny particles. -
Dalton - 1803
He came up with the atomic theory. -
Becquerel - 1896
He discovered radioactivity. -
Thomson - 1897
He discovered the electron. -
Gold Foil Experiment - 1904
Showed Rutherford that there was a nucleus. -
Robert Millikan - 1908
He determined the charge and mass of an electron. -
Bohr - 1915
Created the Bohr model, showing that electrons were on fixed paths. -
Francis Aston - 1922
Aston studied and discovered the isotope during a mass spectrometer. -
Schrodinger - 1926
He used math problems to describe the probability of where an electron will be. (The Quantum Model) -
James Chadwick - 1932
He discovered evidence toward the existance of neutrons. -
Rutherford - 1904
He discovered that atoms contain a nucleus.