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However , it was not until the early nineteenth century that John Dalton -LRB- 1766 ? 1844 -RRB- , a British schoolteacher with a keen interest in science , supported this hypothesis with quantitative measurements . Since that time , repeated experiments have confirmed many aspects of this hypothesis , and it has become one of the central theories of chemistry . Other aspects of Dalton 's atomic theory are still used but with minor revisions -LRB- details of Dalton 's theory are provided in the chapter on atoms and molecules -RRB- . An atom is so small that its size is difficult to imagine .
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