-
101
600 bc Thales
Thought everything including life came from water. -
101
460-370 bc Democritus
Thought their was an atom. -
Sir Isaac Newton
Thought atoms moved around and did not stay in place. -
Dalton
Came up with the atomic theory. -
Becquerel
Discovered radio activity. -
Thomson
Discovered electrons -
Ernest Rutherford
Atoms contain a nucleus made of protons. -
Robert Millikan
Determined the change and mass of an electron. -
Bohr
Shows electrons in atoms are different energy around a nucleus. -
Francis Aston
Discovered isoptopes -
Schrodinger
Quantum model -
James Chadwick
Discovered evidence towards the existance of neutrons -
Gold Foil Experiment
Fired helium atoms at a sheet of gold. Finding out that not all went straight through.