A) \[Na<Mg<Al<Si\]
B) \[Na<Al<Mg<Si\]
C) \[Na>Mg>Al>Si\]
D) \[Na<Si<Al<Mg\]
Correct Answer: B
Solution :
The first ionisation potential is the energy required to pull out first electron from the outer most orbit. The sequence for this is as follows \[Na<Al<Mg<Si\] The first ionisation potential increases along the period from left to right.
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