The first ionisation energy of aluminium is slightly lower than that of magnesium, becauseA.in aluminium the electron is being lost from a doubly filled orbitalB.the outer electron in aluminium is in a p-orbital not an s-orbitalC.magnesium has a higher nuclear charge D.the radius of the aluminium atom is greater than the magnesium atom
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For Al, the leaving electron is in a p-sublevel, higher in energy than the leaving electron in Mg, which is in an s-sublevelTherefore, it takes less additional energy (lower ionization energy) to remove the electron from AlGo with B.
