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Oct 4, 1001
Thales 620 BC
Thought everything was made from something, began curiousity -
Oct 4, 1002
Democritus 440 BC
Came up with the "atom" -
Oct 4, 1003
Aristotle 384-322 BC
Didnt believe in atomic theory -
Newton 1704
Thought the same as Democitus -
Dalton
Came up with Atomic Theory -
Becquerel
Discovered radioactivity -
Thompson
Discovered Electrons -
Ernest Rutherford
Atoms contain a nucleus made of protons -
Bohr
Shows electrons in atoms are different energy -
Robert Millikan
Determined charge and mass of electron -
Francis Aston
Discovered isotopes -
Schrodinger
Quantom model -
James Chadwick
Discovered evidence that neutrons exist