Question

a) Metallic sodium adopts a bcc structure with density 970 kg·m^-3. What is the length of the edge of a unit cell? b) Depending on temperature, RbCl can exist in either the rock-salt or CsCl structure type. Give the cation and anion coordination number for each structure type. In which will Rb have the larger apparent radius? c) Use radius-ratio rules and ionic radii to predict the likely structures of (a) PuO₂; (b) AlN, (c) BeO, and (d) FrI.

Answer 1