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Revision as of 23:07, 15 October 2005 by Icairns (talk | contribs) (dab element)(diff) ← Previous revision | Latest revision (diff) | Newer revision → (diff)The Hill system is a system of writing chemical formulas such that the number of carbon atoms in a molecule is indicated first, the number of hydrogen atoms next, and then the number of all other chemical elements subsequently, in alphabetical order.
By sorting formulas according to the number of atoms of each element present in the formula according to these rules, with differences in earlier numbers being treated as more significant than differences in any later number — like sorting text strings into lexicographic order — it is possible to collate chemical formulas into what is known as Hill system order.
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