SINCE 1828
Stock system
noun
\ ˈstäk-\
variants:
or Stock's system
Definition of Stock system
: a system in chemical nomenclature and notation of indicating the oxidation state of the significant element in a compound or ion by means of a Roman numeral that is used in parentheses after the name or part of the name designating this element and ending invariably in -ate in the case of an anion and that is placed above and to the right of the symbol for this element
according to the Stock system nitrous oxide is named nitrogen (I) oxide, ferrosoferric oxide Fe3O4 is iron (II, III) oxide FeIIFeIII2O4, and potassium manganite is potassium manganate (IV) K2MnIVO3
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Merriam-Webster unabridged
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