-
101
Thales-620 BC
First person to think of the atom. -
101
Democritus- 440 BC
He was the first to think of the atomic theory. -
101
Aristotle- 340 BC
He believed in the Four Elements -
Isaac Newton
He believed that matte is formed fo solid, massy particles and contributed to the idea of the atomic theory. -
John Dalton
His contribution was Dalton's Atomic Theory. -
Henri Becquerel
Figured out elements could be radioactive. -
J.J. Thomson
Thomson discovered the electron. -
Robert Andrews Millikan
His Oil Drip experiment found the charge of individual electrons. -
Ernest Rutherford
He created the Gold Foil Experiment. -
Gold Foil Experiment
This proved that a portion of the atom was positively charged and relatively heavy. -
Niels Bohr
Found that the electron has a certain orbit around the nucleus. -
Francis Aston
He is the man that found isotopes. -
Erwin Schrodinger
He used math equations to find the probability an electron would be in a certain position. -
James Chadwick
He discovered the neutron.
