How do I know when to use Roman Numerals when writing a chemical formula? Anyone know? @Mathematics

How do I know when to use Roman Numerals when writing a chemical formula? Anyone know? @Mathematics

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You're going to use a Roman numeral if the element is a transition metal.

Thankyou, but how do you know what number to wite?

It's going to be based on the charge. For example: Cu3+ (III) Cu2+ (II) Cu1+ (I)

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