The radius of Ag ion is 126 pm while of I ion is 216 pm. The co-ordination number of Ag in AgI is — Solid State Chemistry Question

💡 Solution & Explanation

Radius ratio $r_+ / r_- = 126 / 216 \approx 0.583$. This value lies in the range [0.414, 0.732), which corresponds to an octahedral void geometry having a coordination number of 6. Therefore, correct answer is C.