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. This deterministic system enables straightforward sorting and searching of compounds.
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“The fact that Romans once inhabited her reflects no little dignity on Nature herself; that from some particular hill the Roman once looked out on the sea.”
—Henry David Thoreau (1817–1862)
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