Answer: ns2np3.
- A ns2np3
- B ns2np4
- C ns2np2
- D ns2np5
Correct answer: A. ns2np3
Explanation: Group 15 (nitrogen family) elements have five valence electrons arranged as ns2np3, giving a half-filled p sub-shell that adds to their stability.

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.