Answer: Fluorine (F).
- A Fluorine (F)
- B Chlorine (Cl)
- C Oxygen (O)
- D Nitrogen (N)
Correct answer: A. Fluorine (F)
Explanation: Fluorine is the most electronegative of all elements (Pauling scale: 4.0).
Xenon tetrafluoride (XeF4) has six electron domains around xenon — four Xe–F bonds plus two lone pairs. The lone pairs occupy opposite axial positions, leaving the four fluorine atoms in a square-planar shape (Xe–F ≈ 194 pm). Image: ChemSim, Public Domain, via Wikimedia Commons.
Concept context
Covers the nitrogen family (Group 15), oxygen family (Group 16), halogens (Group 17), and noble gases (Group 18). One of the highest-weightage inorganic chapters in NEET and JEE - includes preparation and properties of HNO₃, H₂SO₄, interhalogens, and xenon compounds.