In sodium chloride crystal, the unit cell edge length is a. The option(s) representing correct combi — Solid State Chemistry Question

💡 Solution & Explanation

In NaCl rock-salt lattice (edge length $a$): (A) 12 Na$^+$ at $a/\sqrt{2}\approx0.707a$. \checkmark (B) 8 Cl$^-$ at $a\sqrt{3}/2\approx0.866a$. \checkmark (C) 6 Na$^+$ at distance $a$. \checkmark (D) 24 Cl$^-$ at $a\sqrt{5}/2\approx1.12a$. \checkmark All options correct: $\boxed{A,B,C,D}$