The number of octahedral voids in a $BCC$ structure is:

Total volume of atoms present in a face-centred cubic unit cell of a metal is ($r$ is atomic radius)

$Zn$ transforms from its solid state to its molten state. What is its coordination number in the molten state?

Identify the unit cell from the following that contains four particles in it.

$A$ compound is formed by elements $A$ and $B$. This crystallises in the cubic structure where the $A$ atoms are at the corners of the cube and $B$ atoms are at the body centres. The simplest formula of the compound is

$A$ 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