An ionic crystalline solid, MX3, has a cubic unit cell. Which of the following arrangement of the io — Solid State Chemistry Question

💡 Solution & Explanation

Let's check option (a): M3+ ions at corners = 8 × 1/8 = 1. X- ions at face centers = 6 × 1/2 = 3. The ratio of M : X is 1 : 3, which matches MX3. For option (b), ratio is 1:1. For option (c), ratio is 3:1. For option (d), ratio is 1:1. Thus, only option (a) is correct.