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He believed that atoms are constantly moving, atoms are "uncuttable" and they are small, hard practice particles.
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Dalton conducted experiments by combining elements, discovered atoms of different elements are different, stated all substance are made of atoms, and elements combined in specific proportions
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Thomas created the plum pudding, found they are small, negatively charged particles inside an atom and conducted the cathode-ray tube experiment
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Rutherford conducted the gold foil experiment, discovered there is a small, dense, positively charged nucleus and stated atoms mostly contain empty space and most of atom's mass is in the nucleus
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Bohr discovered electrons jump between levels from path to path, they also move in the empty space of an atom and they travel in definite paths
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They discovered electron paths cannot be predicted and electron are found in clouds, not paths,
