The structure of $TlCl$ is similar to $CsCl$. What is the coordination number of $Tl^{+}$?

What is the coordination number of a particle in $hcp$ structure?

In an ionic crystal,ion $A$ is present at the corners of the cubic unit cell,and ion $B$ is present at the centers of the faces. What is the formula of this ionic compound?

Which of the following metals has a $ccp$ crystal structure?

What are the number of atoms per unit cell in $BCC$ and $FCC$ respectively?

In an $NaCl$ crystal,how many $Cl^{-}$ ions surround each $Na^{+}$ ion?