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101
Thales of Miletus
Thought everything was made of water or the cosmological thesis. -
101
Democritus
Believed that the atomic model was a circle and the atomic theory. -
101
Aristotle
Believed that everything was made of Earth, Fire, Water, and Air. Believed that he was right and Democritus was wrong. -
Isaac Newton
Figured out gravity, laws of motion, and the light spectrum. Believed that Democritus was right about the Atom. -
John Dalton
Believed that matter is made up of atoms that are indivisible and indestructible, all atoms of an element are identical, atoms of different elemts are different, atoms of different elements combine in simple whole numbers to form compunds, atoms can be created or destroyed. Believed atom was just a circle and had no experiment. -
Bequerel
Discovered radioactivity, his experiment was with Uranium. -
JJ Thompson
Discovered electrons, experiment was the Cathode Ray Tube. Believed in the plum pudding model. -
Gold Foil Experiment
This experiment was created by Rutherford. -
Rober Milican
Made the oil drop experiment and found charge and mass of electron. -
Rutherford
Discovered nucleaus with the gold foil experiment he had, discovered protons and that the atomic model was planetary. -
Niels Bohr
Discovered model for the atom, electrons orbited around nucleus in paths and the electron theory. -
Francis Aston
Discovered isotopes but didn't know they are isotopes. His experiment was the mass-spectograph. Atomic model same as Bohr's. -
Erwin Schrodinger
Created Schrodinger's model, predicted where the odds of electrons are. -
James Chadwick
Proved neutrons existance, Chadwick updated model of the atom and added neutrons in it.