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400
democritus
made observations and was a student at socrates in greek named the atom atomos -
john dalton
made observations as well but made these rules
1: everything is made of atoms
2: cant be broken down
3:atoms of each element are unique -
einstein
mathmatically proved atoms true -
JJ thompson
cathode ray tube experiment also the pumb pudding/cookie modle -
ernest rutherford
gold foil experiment -
heisenberg
uncertainty principle: you can never know exactly where a electron is located -
neils bohr
organized electrons into levels