Chemistry / Chem 0317 · Atom · ~20 seconds
The Retired -ic/-ous Naming System
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An older naming system used -ic for a metal's higher charge and -ous for its lower charge instead of a Roman numeral.
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"Stannous fluoride" on a toothpaste tube names SnF2, what current nomenclature calls tin(II) fluoride using the Stock system instead.
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This system still appears on some commercial labels, but it is retired scientific practice, not a valid alternative to Roman-numeral naming.
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