Beyond Group 7, no higher oxides of Fe above Fe2O3, are
known, although ferrates (VI)(FeO4)
2–, are formed in alkaline media but
they readily decompose to Fe2O3 and O2 Besides the oxides, oxocations
stabilise V
v as VO2
+, V
IV as VO
2+ and Ti
IV as TiO
2+ The ability of oxygen
to stabilise these high oxidation states exceeds that of fluorine Thus
the highest Mn fluoride is MnF4 whereas the highest oxide is Mn2O7