$A$ compound crystallizes in a $NaCl$ type structure. What is the percentage of unoccupied tetrahedral voids?

What is the number of atoms per unit cell in a body-centered cubic $(BCC)$ unit cell?

Which of the following contains rock salt structure?

Explain the calculation of the number of atoms in a body-centered cubic $(bcc)$ unit cell.

$A$ crystal is formed by two elements $X$ and $Y$ in a cubic structure. $X$ atoms are at the corners of a cube,while $Y$ atoms are at the face centers. The formula of the compound will be:

In an $fcc$ structure,the location of the octahedral void is at ........