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Question

How many pairs are, in which first species has lower ionization energy than second species?

(i) N and O            (ii) Br and K      (iii) Be and B      (iv) I and I

(v) Li and Li+      (vi) O and S        (vii) Ba and Sr


Solution

(v) Li<Li+; Li+ has a noble gas configuration which is stable and hence difficult to disturb. Hence, it has a higher ionization energy than Li.                  
(vii) Ba < Sr; As we go down the group, ease of ionization increases. This means that Ba is easier to ionise than Sr, hence it will have a lower ionization energy.

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