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Which of the following comparisons represents an INCORRECT order? (A) Al > Ga (atomic radius) (B) F+ > Cl+ (electron affinity) (C) N+ > O+ (ionisation energy) (D) O > Se (electronegativity)

1. Al > Ga (atomic radius)
2. F+ > Cl+ (electron affinity)
3. N+ > O+ (ionisation energy)
4. O > Se (electronegativity)

Correct answer: N+ > O+ (ionisation energy)

Solution

IE of N+ = 2nd IE of N = 29.6 eV; IE of O+ = 2nd IE of O = 35.1 eV. So O+ > N+ in ionisation energy, making the order N+ > O+ incorrect. The other three orders are correct.

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