A Roman numeral is used in the name of transition metal ions. That numeral indicates the charge of the ion.

Name: A Roman numeral is used in the name of transition metal ions. That numeral indicates the charge of the ion.
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The Roman numeral in the name of a transition metal ion indicates the oxidation state (charge) of the ion, which is necessary because many transition metals can form ions with different charges.

A Roman Numeral Is Used in the Name of Transition