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In this case the roman numerals indicate the oxidation state of the cation portion of the polyatomic ion: [Fe(II)O2]2- as opposed to [Fe(III)O2]1- Mn(II)=Mn2+

Mn(VII)=Mn7+

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Nasir Sipes

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In this case the roman numerals indicate the oxidation state of the cation portion of the polyatomic ion: [Fe(II)O2]2- as opposed to [Fe(III)O2]1- Mn(II)=Mn2+

Mn(VII)=Mn7+

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Henriette Pagac

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3y ago
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Q: Why roman must be included in the names of MnO2 and Mn2O7?
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