Question
Which of the elements Na, Mg, Si and P would have the greatest difference between the first and second ionisation enthalpies? Briefly explain your answer.
✓
Answer
Na has greatest difference between first and second ionisation enthalpies because Na has stable electronic configuration, i.e., $1 s^2 ~2 s^2 ~2 p^6$, therefore, it has very high second ionisation energy.
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