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When is a roman numeral most likely needed in the name of an ionic compound

When is a roman numeral most likely needed in the name of an ionic compound
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When is a roman numeral most likely needed in the name of an ionic compound

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User Abhinavkulkarni
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Well to put it simply, its needed when the cation is a transition metal.

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User Nicogpt
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AN ionic compound with more than one charge uses a roman numeral. For example copper (III) sulfate and copper (II) sulfate nomenclature is used because copper has 2 charges +2 and +3. Among other metals are mercury, lead, tin, etc.
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User Rickyalbert
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