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Atoms are "uncuttable"
Atoms are small, hard particles -
Democritus' Atom model
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All substances are made of atoms
Atoms of different elements are different
Atoms of the same element are exactly alike
Elements combine in specific proportions
He conducted experiments in combining elements -
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Conducted the cathode-ray tube experiment
Theory lead to the "plum-pudding" model
There are small, negatively charged particles inside an atom -
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Most of an atom's mass is in the nucleus
There is a small, dense, positively charged nucleus
Conducted the gold foil experiment
Electrons move in empty space in the atom
Atoms contain mostly empty space -
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Electrons jump between levels from path to path
Electrons travel in definite paths -
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Electron paths cannot be predicted.
Electrons are found in Electron Clouds, not paths. -
