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Matter is composed of the elements: Earth, Fire, Air or Water
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atoms are 'uncuttable'
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Atoms of different elements are different
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He conducted experiments in combining elements and found they combine in specific ratios
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There are small, negatively charged particles inside an atom
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He conducted the cathode-ray tube experiment.
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Most of an atom's mass is in the nucleus
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There is a small, dense, positively charged nucleus.
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Atoms contain mostly empty space
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Electrons can jump from a path in one level to a path in another level.
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electrons travel in certain paths, or energy levels.
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Confirmed the presence of a neutral particle in the nucelus.
