" The highest Mangannese fluoride is "

The highest Manganese fluoride is

Fluoride ion

Fluoride ion

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

Give reason for the following : Although ‘F’ is more electronegative than 'O', the highest Mn fluoride is MnF_4 , whereas the highest oxide is Mn_2O_7 .

Highest oxidation state of manganese in fluoride is + 4 (MnF_(4)) but highest oxidation state in oxides is + 7 (Mn_(2)O_(7)) , because -