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JEE Main20252 Apr 2025Morning ShiftChemistryClassification of Elements and Periodicity in PropertiesActual

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 given below:

Options

  1. AB and D only
  2. BA and C only
  3. CB only
  4. DA, B, C and D

Correct answer

C. B only

Step-by-step solution

The order of first four elements of group-17 are as follows. ( F Cl Br I ) (Covalent radius) ( Cl F Br I ) (Electron affinity) ( F ⁻ Cl ⁻ Br ⁻ I ⁻ )(Ionic radius) ( F Cl Br I ( I ^ st . ) ionization energy ) Electron affinity order is irregular.

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