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-Atoms are small, hard particles
-Atoms constantly move -
Democritus
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-All substances are made of atoms
-Atoms are "uncuttable"
-Atoms of different elements are different
-Atoms of the same element are exactly alike
-Elements combine in specific proportions
-Conducted experiments in combining elements -
John Dalton
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-Conducted the Cathode-Ray tube experiment
-Theory of the atomic structure leads to the "plum-pudding" model
-There are small, negatively charged particles inside an atom -
J.J. Thomson
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-Atoms contain mostly empty space
-Conducted the gold foil experiment
-Most of an atom's mass is in the nucleus
-There is a small, dense, positively charged nucleus -
Ernest Rutherford
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-Electrons jump between levels from path to path
-Electrons move in empty space in the atom
-Electrons travel in definite paths -
Niels Bohr
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-Electrons paths cannot be predicted
-Electrons are found in electron clouds, not paths -
-Electrons are found in electron clouds, not paths
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Erwin Schrodinger and Werner Heisenberg
