The first IE of magnesium is greater than that of aluminium because a) Al atom is very large when compared to Mg b) Al atom has an electron more when compared to Mg c) Mg has a stable electronic configuration d) Al has a stable electronic configuration
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Ionization potential decreases on going from left to right but ionization potential of Al<Mg. Aluminium, after losing one electron, attains a stable full filled configuration and magnesium has a stable full filled configuration. Therefore, it is easier to remove an electron from aluminium and difficult to remove from magnesium. Thus, ionization potential of Mg>Al.
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