Moderate

The abnormal electron affinity values are associated with:

Correct answer: B. II A, V A

  • A. I A
  • B. II A, V A
  • C. V A, VII A
  • D. V A, VIII A

Explanation

The correct answer is Option B: II A, V A. Elements in group II A, such as alkaline earth metals, have filled s orbitals, which makes them stable and reluctant to gain additional electrons, resulting in low electron affinity. Similarly, group V A elements have half-filled p orbitals, making them relatively stable and also resulting in lower electron affinity values.Option A is incorrect because group I A elements prefer to lose electrons to achieve a stable electron configuration rather than gain them. Option C is incorrect because group VII A typically shows high electron affinities due to the need to complete their valence shell. Option D is incorrect because although group V A has low electron affinity values, group VIII A elements generally do not seek additional electrons at all, having a complete octet.

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