Question

Why is there
a gradual decrease in the ionization energy from Be to Li

Answer 1

there is enlargment of atom towards be to Li

Explanation:

as size of atom increases nuclear charge decreases and ionization decreases

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Answer 2

The electronic configuration of Lithium is 2 S¹and that of beryllium is 2 S².So the Z effective of Lithium is less than that of beryllium .Therefore the ionization energy of Lithium is less than that of beryllium .

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