ns1 and ns2 outermost electronic configuration of s-block elements. They are all reactive metals with
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a
high ionisation enthalpies
b
low ionisation enthalpies
c
larger principal quantum number
d
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.