How many pairs are, in which first species has lower ionisation energy than second species: (i) N an — Periodic Table and Periodicity Chemistry Question

Question

How many pairs are, in which first species has lower ionisation 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