Which of the following order is correct for the property mentioned in brackets ? — Periodic Table and Periodicity Chemistry Question

💡 Solution & Explanation

(a) Correct order -> Ca2+ > K+ > Cl- > S2- (Ionisation energy). (b) Correct order -> C < N < F < O (2nd I.E.). Second electron removal from oxygen requires more energy as it acquires stable 2s2 2p3 configuration. (c) Correct order -> B > Tl > In > Ga > Al (Electronegativity). (d) Correct order -> Na+ > Li+ > Mg2+ > Al3+ > Be2+ (Ionic radius).