A) Na
B) K
C) Be
D) Mg.
Correct Answer: C
Solution :
Alkali metals have lower ionisation potential than alkaline earth metals due to the extra nuclear charge in alkaline earth metals (which pulls \[{{e}^{-}}\]inwards). Also, Mg has got lower ionisation potential than Be as electron to be removed from Mg is present in one shell outwards than in Be.
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