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

For some crystals,the radius ratio for cation and anion is $0.525$,its coordination number will be

Body centered cubic lattice has a coordination number of

The radius of the largest sphere which fits properly at the centre of the edge of a body-centered cubic $(BCC)$ unit cell is (Edge length is represented by $a$) (in $a$)

Which of the following exhibits an $8:8$ coordination type packing?

$A$ compound is formed by elements $A$ and $B$. Atoms of $A$ are present at the corners of the cube,and atoms of $B$ are present at the body center. What is the formula of the compound?