Which of the following principles strictly explains why of Magnesium () is higher than of Aluminium — Periodic Table and Periodicity Chemistry Question
Question
Which of the following principles strictly explains why $IE_1$ of Magnesium ($Mg$) is higher than $IE_1$ of Aluminium ($Al$)?
Answer: C
💡 Solution & Explanation
The $3s$ orbital is spherical and penetrates closer to the nucleus. Breaking the fully-filled $3s^2$ configuration of Mg costs more energy than removing the single $3p^1$ electron of Al.
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