He devised the system of chemical symbols and formulae.
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The present chemical symbols express the systematizing of chemistry by the atomic theory of matter. The English chemist John Dalton, who followed the alchemists in representing the elements pictorially, made the important advance of letting his symbols designate single atoms of elements, not indefinite amounts.
A chemical symbol is a one- or two-letter designation of an element. Compounds are combinations of two or more elements. A chemical formula is an expression that shows the elements in a compound and the relative proportions of those elements.
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