MCQ
The first $I.E.$ of $Na, Mg, Al$ and $Si$ are in the order
- A$Na < Mg < Al < Si$
- ✓$Na < Al < Mg < Si$
- C$Na < Al < Si < Mg$
- D$Na > Mg > Al > Si$
On moving from left to right in a period, the ionization energy increases.
Al has lower ionization energy than Mg. Al has valence shell electronic configuration $3 s^{2} 3 p^{1}$.
Mg has valence shell electronic configuration $3 s^{2}$.
Less energy is required to remove a p electron than filled s electron from the same principal quantum shell.
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