The number of $Cl^{-}$ ions around one $Na^{+}$ in $NaCl$ crystal lattice is

The intermetallic compound $LiAg$ crystallizes in a cubic lattice in which both lithium and silver have a coordination number of $8$. The crystal class is

In the zinc blende structure,zinc atoms fill up:

What is the coordination number of each atom in a $bcc$ structure?

An alloy made up of $A$ and $B$ metals crystallises in a cubic lattice, where $B$ atoms occupy the corners and $A$ atoms occupy the face centers. The formula of the alloy formed is

Determine the number of atoms per unit cell in a body-centered cubic $(BCC)$ unit cell.