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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.
A chemical formula is a way of expressing information about the proportions of atoms that constitute a particular chemical compound, using a single line of chemical element symbols and numbers. PubChem uses the Hill system whereby the number of carbon atoms in a molecule is indicated first, the number of hydrogen atoms second, and then the number of all other chemical elements in alphabetical order. When the formula contains no carbon, all the elements, including hydrogen, are listed alphabetically.