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Leuccipus and Democritus were the first known in occidental culture who used the notion of atom in their speculations about the composition of matter
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In chemical transformations matter may change its form or shape, but its mass remains the same.
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The amounts of mass of different substances in chemical reactions are related.
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Elements always form a compound in the same proportions in mass
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The ratios between the masses of an element that reacts with a fixed mass of another element to form different compounds are simple whole numbers
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Dalton supposed real different indestructible atoms formed matter
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Crooke's tubes
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Joseph John Thomson with a cathode rays tube
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Atoms seem to be hollow
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Positive sphere with electrons
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Positive nucleus and electron turning around at long distances
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Light and matter
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Electron are in orbitals
