Chemistry / Chem 0181 · Atom · ~20 seconds
Dalton's Atomic Theory
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Dalton's 1807 atomic theory holds that matter is made of indivisible atoms, each element's atoms identical in mass and unchanged by reactions.
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Copper keeps its atomic identity through every chemical change, so heating it alone never produces a different, simpler substance.
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Dalton called atoms indivisible; later discoveries added subatomic particles without discarding his other four postulates.