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101
Thales of Miletus- 600 BC
Cosmological Thesis, thought everything was made of water. Most famous philosophical position, helped Democritius. -
101
Democritius- 460 BC
The Atomic Theory. First person to think of the Atom. -
101
Aristotle- 400 BC
People believed him instead of Democritius, but Democritius was correct. -
Sir Isaac Newton
Gravity, Law of motion, light spectrum. Was publlic that Democritius was right. -
John Dalton
Atomic Theory of Matter- has an experiment, but no name. Mattter is made up of atoms that are indivisible and indestructible. All atoms of an element are identical. Atoms of different elements are different. Atoms of different elements combine in simple whole numbers to form compounds. Atoms cannot be created or destroyed. -
Antoine Henri Becquerel
Uranium, discovery of radioactivity. -
JJ Thomson
Cathode ray tube. Discovered election, Plum pudding model. -
Robert Millikan
Oil Drop. This helped in determining the charge and mass of the electron. -
Bohr
Discovered the model for the atom. -
Francis Aston
Mass spectograph, Discovered many different Isotopes. Didn't know why there were Isotopes. -
Erwin Schrodinger
Schrodingers model. Predicts the odds of where the electron will be. -
James Chadwick
Proved the neutron's existance.