JEE Main 2025 Chemistry question
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:
Answer: (2)
Solution
Only electron affinity shows irregularity: Cl > F > Br > I (F has lower EA than Cl due to small size and electron-electron repulsion).