The correct increasing order of electron affinity value of atom is:
Correct answer: A. I < Br < F < Cl
- A. I < Br < F < Cl
- B. I < Cl < F < Br
- C. I < F < Br < Cl
- D. F < Cl < Br < I
Explanation
Option A is correct as Cl has the highest E.A in its group. Although Fluorine is expected to have the highest E.A but due to its small size and large electron density there are electron-electron repulsions and hence some energy is used in overcoming those repulsions. Thus the order of E.A becomes; I<Br<F<Cl. All other options are incorrect.
This question appeared on the HEC Phase I 2017 paper, which you can sit online with every answer explained.
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About Periodic Properties and Trends
Periodic properties arise from electron configuration and effective nuclear charge, producing trends in atomic and ionic radius, ionization energy, electron affinity, electronegativity, metallic character and reactivity. Comparisons run across periods and down groups, with attention to common exceptions. The topic also relates these trends to the behavior of s-block and p-block elements.
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