The radius of a calcium ion is 94 pm and of an oxide ion is 146 pm. Predict the crystal structure of calcium oxide.
CsCl structure
NaCl structure
ZnS structure
CaF2 structure
The density of CaO is 3.35 gm/cm3. The oxide crystallises in one of the cubic systems with an edge of 4.80 Å. How many Ca++ ions and O-2 ions belong to each unit cell, and which type of cubic system is present?