_____________________________________Aluminum Electronic Configuration:
, and Magnesium's Valence Energy Orbital i.e. 3s. the electrons are paired that means it has 2 electron that's why it is written as 
. It is energetically favorable for all the electrons in an orbital to be paired, which means that breaking up this pair would require more energy, that is why magnesium has more ionization energy. The Aluminum does not have paired electrons thus they are removed much easily than the paired electrons in the Magnesium.Any one knows this ?
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