1 Oxides and Oxoanions of Metals
These oxides are generally formed by the reaction of metals with
oxygen at high temperatures All the metals except scandium form
MO oxides which are ionic 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