A) \[Na>Mg>Al>Si\]
B) \[Na<Mg<Al<Si\]
C) \[Na<Si<Al<Mg\]
D) \[Na<Al<Mg<Si\]
Correct Answer: D
Solution :
Generally, ionisation potential increases, as we move from left to right in a period. However, the ionisation potential of II group elements is higher than that of the III group elements. This is because of the fully filled \[s-\]orbitals in II group elements. Hence, the correct order of ionisation potential is \[Na<Al<Mg<Si\]
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