The edge length of a face-centred cubic unit cell is $508 \ pm$. If the radius of the cation is $110 \ pm$, the radius of the anion is .............. $pm$.

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

The number of close neighbours in a body-centred cubic $(BCC)$ lattice of identical spheres is:

The number of spheres contained $(i)$ in one body centred cubic unit cell and $(ii)$ in one face centred cubic unit cell,is

In a face-centered cubic $(FCC)$ arrangement,atoms $A$ are present at the corners and atoms $B$ are present at the face centers. If $4$ atoms of $A$ are removed from the corners,what is the empirical formula of the compound?

The coordination number of $Ba^{2+}$ ion in Barium fluoride $(BaF_2)$ is $8$. What must be the coordination number of fluoride ion $(F^{-})$?