The difference between the first and second ionization energies is significantly higher for alkali metals (like Sodium, Na) compared to alkaline earth metals (like Magnesium, Mg). Therefore, in the context of the problem, X=Na and Y=Mg.
<p>The difference between the first and second ionization energies is significantly higher for alkali metals (like Sodium, Na) compared to alkaline earth metals (like Magnesium, Mg). Therefore, in the context of the problem, X=Na and Y=Mg.</p>
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