The structure of $TlCl$ is similar to $CsCl$. What would be the radius ratio in $TlCl$?

In a solid $AB$,$A$ atoms are in $ccp$ arrangement and $B$ atoms occupy all the octahedral sites. If two atoms from the opposite faces are removed,then the resultant stoichiometry of the compound is $A_{x} B_{y}$. The value of $x$ is ..... [nearest integer]

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

What is the coordination number of sodium in $Na_2O$?

Choose the correct statement for the given cubical structure.

Body centered cubic lattice has a coordination number of