In each of the following ionic solids, the coordination number of the cation and anion is same, exce — Solid State Chemistry Question

💡 Solution & Explanation

$MgO$ has rock salt structure with 6:6 coordination. CsCl has 8:8 coordination. $CaF_2$ has fluorite structure with 8:4 coordination. $Al_2O_3$ has corundum structure with 6:4 coordination. Therefore, the coordination numbers of cation and anion are different in $CaF_2$ and $Al_2O_3$.