The radius of the calcium ion is $94 \text{ pm}$ and the radius of the oxide ion is $146 \text{ pm}$. What is the possible crystal structure of calcium oxide?

Find the radius of an atom in $fcc$ unit cell having edge length $393 \ pm$. (in $pm$)

How many "nearest" and "next nearest" neighbours,respectively,does potassium have in a $bcc$ lattice?

The number of octahedral voids in a unit cell of a cubical closest packed structure is

$A$ crystal is made up of metal ions $M_1$ and $M_2$ and oxide ions. Oxide ions form a $ccp$ lattice structure. The cation $M_1$ occupies $50 \%$ of octahedral voids and the cation $M_2$ occupies $12.5 \%$ of tetrahedral voids of the oxide lattice. The oxidation numbers of $M_1$ and $M_2$ are,respectively:

In a body-centered cubic $(BCC)$ structure like $CsCl$,the distance between the two nearest neighboring spheres is equal to: