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who proposed the 1st atomic theory​

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John Dalton

In 1803 John Dalton published the first comprehensive atomic theory in A New System of Chemical Philosophy. He proposed that the elements are comprised of indestructible atoms, each chemical element possesses a particular kind of atom and all the atoms of a particular element being identical.

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Leucippus and Democritus

  • The ancient atomic theory was proposed in the 5th century bc by the Greek philosophers Leucippus and Democritus and was revived in the 1st century bc by the Roman philosopher and poet Lucretius.

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