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The property/properties that show irregularity in first four elements of group-17 is/are (A) Covalent radius (B) Electron affinity (C) Ionic radius (D) First ionization energy Choose the correct answer from the options below: (1) A and C only (2) B only (3) B and D only (4) A, B, C and D

1. A and C only
2. B only
3. B and D only
4. A, B, C and D

Correct answer: B only

Solution

Electron affinity shows irregularity among the first four elements of group-17 due to the unique electronic configurations and atomic structures of fluorine and chlorine, which differ from the expected trend. This irregularity is not observed in the other properties listed, making option B the correct choice.

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