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Carbon first, hydrogen second, then everything alphabetically.
Also known as: Hill notation, Hill formula, Molecular formula ordering
The Hill system fixes the order of elements in a molecular formula so that the same compound always sorts to the same place in an index. Carbon comes first, then hydrogen, then everything else alphabetically — and if there is no carbon, everything is alphabetical including hydrogen.
Denotes the convention ordering elements in a molecular formula: carbon, then hydrogen, then all others alphabetically.
Contexts: Laboratory
Reverts to strict alphabetical order including hydrogen when the compound contains no carbon, which is the rule most often forgotten.
Contexts: Laboratory
Exists for indexing rather than for chemistry: it guarantees one formula per compound so that printed and database indexes sort consistently.
Contexts: Laboratory
A sequence of element symbols each followed by a subscript numeral, ordered with C and H at the front.