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Said atoms are "ucncuttable". Atoms are small, hard particles. All substances are made of atoms. Atoms constantly move.
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Atomic Model
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Atoms of different elements are different. Atoms of the same element are exactly alike. Elements combine in specific proportions. Conducted experiments in combining elements.
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There are small, negatively charged particles inside and atom. His theory lead to the "plum-pudding" model. Conducted the cathode-ray experiment.
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Conducted gold foil experiment. There is a small, dense, positively charged nucleus. Most of an atom's mass is in the nucleus. Electrons move in empty space in the atom.
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Believed electrons jumped between levels from path to path. Electrons travel in definite paths.
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Believed electron paths can not be predicted. Electrons are found in electron clouds, not paths.
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