This is a question folowed by introduction of metallic bonding?
it has been some time since I have had O-Chem, but if I remember correctly, it comes happens as it does because of the outer shell of electrons being filled when the conversion to Fe2O3 is complete, where as with Al2O3, it is notI remember has something to do with the type of metal too, Iron is a transitional metal where as Aluminum is a poor metal Hope this helps in the right directionAluminum ions form a soluble complex ion with hydroxide ions, while iron ions do not.
If you look in the periodic table, an atom of aluminium has 13 electrons so if it has 10 electron after forming an ion, it implies that Al has lost 3 electronsIn other words after having formed an ion, Al has 3 more protons(+ve) than electrons.(-ve) So the overall charge would be Al^3+Al^3+ is called a cation!
