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Why do some ionic compounds contain a roman numeral?
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Why do some ionic compounds contain a roman numeral?

User Shosti
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The Roman numeral denotes the charge and the oxidation state of the transition metal ion. For example, iron can form two common ions, Fe2+ and Fe3+. To distinguish the difference, Fe2+ would be named iron (II) and Fe3+ would be named iron (III).
User Abdallah Nofal
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