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

In a simple cubic unit cell,how many unit cells share each lattice point located at the corner?

What is the coordination number of a particle in a simple cubic close-packed structure?

An element has a face-centred cubic $(fcc)$ structure with a cell edge of $a$. The distance between the centres of two nearest tetrahedral voids in the lattice is

$Pt$ has an $FCC$ structure with an edge length of unit cell $392 \text{ pm}$. What is the radius of $Pt$ (in $\text{ pm}$)?

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?