-
101
Thales 600 B.C.
Though everything was made of something -
101
Democritus 370 B.C.
Thought of the atom -
101
Aristotle 322 B.C.
Though things were made of Earth, Fire, Air, and Water -
Isaac Newton
Backed up the atom -
Becquerel
Discovered Radioactivity -
J.J. Thompson
Discovered the electron -
Robert Millikan
Determined the charge and mass of electron -
Gold Foil Expirement
Showed atoms wouldn't go through a sheet -
Rutherford
Discovered nucles -
Bohr
Made Bohr model; thought electrons were on fixed paths -
Francis Aston
Discovered isotopes -
Schrodinger
The Quantom Model