Examples: Cr2O3, MnO2, NiO.
CuO
Iron is classified as a transition state metal for exactly the same reason that any other element is classified as a transition state element, which is that it has incompletely filled inner electron orbitals.
Transition
Sand is the oxide of what element?
Promethium is a transition element.
So-called NON-transition metals is not a defined group of elements, other than "All other elements that are NOT transition elements".
No. It is not. Iron is an element. Oxygen is an element. Iron Oxide is a compound.
Nickel is not an inner transition element.
Rhenium oxide.
No, aluminum oxide is not an element. Indeed, nothing called an "oxide" can be an element, as this term indicates that the substance is combined with oxygen and is therefore a compound, not an element.
Is Zinx Oxide an Element or a Compound - Compound
There is no sensible answer to the question because scandium IS a transition element.