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Democritus discovered that, atoms are small, hard particles, atoms constantly move and atoms are not able to be cut
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This what was believed to be an atom during Democritus's time
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Dalton discovered that 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. Dalton also
conducted experiments in combining atoms -
This is what was believed to be an atom during Dalton's time
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Thompson's theory of the atomic structure lead to the "plum pudding" model and that there are small negatively charged particles inside an atom. Thompson conducted the cathode-ray tube experiment
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This is what was believed to be an atom during Thomson's time
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Rutherford discovered that, atoms contain mostly empty space, electrons move in empty space in the atom, most of an atom's mass is the nucleus, there is small, dense, positively charged nucleus
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This is what was believed to be an atom during Rutherford's time
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Bohr discovered that electrons jump between levels from path to path and that electrons travel in definite paths.
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This is what was believed to be an atom at the time
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Schrodinger discovered that electron paths can not be predicted and both Erwin and Werner had discovered that electrons are found in clouds and not paths
