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Question

The first ionisation potential of Na,Mg,Al and Si are in the order:

A
Na<Mg<Al>Si
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B
Na<Mg>Al<Si
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C
Na>Mg>Al>Si
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D
Mg>Na>Si>Al
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Solution

The correct option is A Na<Mg>Al<Si
Ionisation potential increases when we move from left to right in a period. But this increase in not regular. The members of second group have more ionisation potential then members of third group due to stable half filled s orbital.
Na<Mg>Al<Si is correct order of ionisation potential.

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