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texts written in 6th century BC to 2nd century BC, such as those of Democritus or [[Vaisesika Sutra]] written by Kanada. This theory was later developed in the modern sense of the basic unit of a chemical element by the British chemist and physicist John Dalton in the 18th century. At this stage, it was not clear what atoms were, although they could be described and classified by their properties (in bulk). The invention of

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