The edge length of the unit cell, if the radius of Mn ion is Å and that of F ion is Å, is — Solid State Chemistry Question

💡 Solution & Explanation

Along the cube edge, a corner Mn ion and an edge-centred F ion touch. The edge length $a = 2(r_{Mn} + r_F) = 2(0.65 + 1.35) = 2(2.00) = 4.00$ Å. Therefore, correct answer is B.