s-Block ElementsHard

Question

Which of the following has maximum ionisation energy ?

Options

A.Ba → Ba+ + e-
B.Be → Be+ + e-
C.Ca → Ca2+ + 2e-
D.Mg → Mg2+ + 2e-

Solution

Down the group size increases and therefore,  attraction between valence shell electron and nucleus decreases and thus ionisation energy decreases.

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