Everything about the Hill System totally explained
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. When the formula contains no carbon, all the elements, including hydrogen, are listed alphabetically.
By sorting formulas according to the number of atoms of each element present in the formula according to these rules, with differences in earlier elements or numbers being treated as more significant than differences in any later element or number — like sorting text strings into
lexicographic order — it's possible to
collate chemical formulas into what is known as
Hill system order.
The Hill system was first published by
Edwin A. Hill of the
United States Patent Office in
1900.
Example
The following formulas are written using the Hill system, and listed in Hill order:
- BrI
- CH3I
- C2H5Br
- HBr
- HI
Further Information
Get more info on 'Hill System'.
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