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The highest Mn fluoride is MnF(4) where ...

The highest Mn fluoride is `MnF_(4)` where as the highest oxide is `Mn_(2)O_(7)` Why?

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The ability of oxygen to stabilize the high oxidation states exceeds that of fluoride. Thus the highest Mn fluoride is `MnF_(4)` where as highest oxide is `Mn_(2)O_(7)`.
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