Stock Naming System in Chemistry

The stock naming system uses roman numerals to indicate the oxidation state of metal ions in ionic compounds.  It is used because many metals have more than one possible oxidation state (charge).  One example of this is tin.  The two most common oxidation states of tin are 2+ and 4+; a Roman numeral is used in the name of the compound to tell us which oxidation state is present in a given compound of tin.


In the past it was also common to see names of compounds using their Latin names.  Some examples include ferrum for iron and aurum for gold.  In the Latin naming system, different suffixes are used to indicate the oxidation state of the metal ion.

I hope this is helpful!

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