The property/properties that show irregularity in first four elements of group-17 is/are: (A) Covalent radius (B)…
Classification of Elements & Periodicity · Class 11 · JEE Main Previous Year 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:
- a
B and D only
- b
A and C only
- c
B only
- d✓
A, B, C and D
A, B, C and D
🧠 Fluorine breaks every trend in Group 17 The Period 2 element always has a special character because its orbitals are small and electron repulsion is unusually high. For Group 17, Fluorine disrupts covalent radius, electron affinity, ionic radius, and first ionization energy — all four.
🗺️ Why each property is irregular Covalent radius: F is disproportionately small. Electron affinity: Cl F due to F's crowded cloud. Ionic radius: is smaller than expected compared to the trend. : F's value is lower than expected from simple period trend relative to other halogens.
All four properties show irregularity. That is option (d).
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