Aluminium displaces iron oxide, so it is more reactiveHowever, if equal size pieces of iron and aluminium are left outside, iron corrodes and aluminium appears not to, why?
By corrosion I'm assuming that you mean oxidationIron is under the metal classification of Transition metal, and Aluminun is under the classification of Other MetalsThe 38 elements in groups 3 through 12 of the periodic table are called transition metalsAs with all metals, the transition elements are both ductile and malleable, and conduct electricity and heatTheir valence electrons are present in more than one shellThis is why they often exhibit several common oxidation statesThe other metals elements are located in groups 13, 14, and 15While these elements are ductile and malleable, they are not the same as the transition elementsThese elements, unlike the transition elements, do not exhibit variable oxidation states, and their valence electrons are only present in their outer shellAll of these elements are solid, have a relatively high density, and are opaqueThey have oxidation numbers of +3, ±4, and -3 Hope this helps.
