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  • 21-06-2017
  • Chemistry
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Why is a Roman numeral needed for iron compounds but not for compounds containing magnesium?

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zehadialam
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  • 21-06-2017
Iron has more than one oxidation state, so the roman numeral tells you what the charge is for the iron ion. Magnesium pretty much always has a +2 charge, so roman numerals aren't needed.
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