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How do you know when to put Roman numerals in the name when balancing chemical formulas?
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How do you know when to put Roman numerals in the name when balancing chemical formulas?

User Stephan Heilner
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If the element has many numbers on the top right corner, you put the roman numeral. For example, iron has +2 and +3. you need to specify which iron ion you're talking about. Fe (II) or Fe (III)
User Skibulk
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