ns1 and ns2 outermost electronic configuration of s-block elements. They are all reactive metals with

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high ionisation enthalpies

low ionisation enthalpies

larger principal quantum number

High electron gain enthalpies

answer is B.

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Detailed Solution

ns1 and ns2 outermost electronic configuration belong to s-block elements.ns1⟶ alkaline metals ns2⟶ alkaline earth metals They are all reactive metals with low ionisation enthalpies.

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