The highest oxidation number in the
oxides, coincides with the group number and is attained in Sc2O3 to
Mn2O7 Beyond group 7, no higher oxides of iron above Fe2O3 are
known Besides the oxides, the oxocations stabilise V
V as VO2
+, V
IV as
VO
2+ and Ti
IV as TiO
2+ As the oxidation number of a metal increases, ionic character
decreases