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

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

ManipalManipal 2002Classification of Elements and Periodicity in Properties

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.