Potassium crystallizes in a $bcc$ lattice. What is the coordination number of potassium in the potassium metal?

$A$ solid has a structure in which $W$ atoms are located at the corners of a cubic lattice,$O$ atoms at the centre of edges,and $Na$ atom at the centre of the cube. The formula for the compound is

Which among the following crystal lattices occupies all of the cubic holes by cations?

$CsBr$ crystal has $bcc$ structure. It has an edge length of $4.3 \ \mathring{A}$. The shortest interionic distance between $Cs^{+}$ and $Br^{-}$ ions is ................ $\mathring{A}$.

$Xe$ crystallizes in an $fcc$ structure. If the edge length of the unit cell of $Xe$ is $620 \, pm$, then the distance between two nearest $Xe$ atoms is .............. $pm$.

The unit cell of diamond is composed of: