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Chemical Symbol Definition: A chemical symbol is a notation of one or two letters representing a chemical element.hemical Symbol Definition: A chemical symbol is a notation of one or two letters representing a chemical element.
The chemical formula for a molecule uses a single line of chemical element symbols, numbers, and sometimes also other symbols, such as parentheses, dashes, brackets, and plus (+) and minus (â) signs. These are limited to a single typographic line of symbols, which may include subscripts and superscripts.