In a crystal of $NaCl$, the distance between $Na^{+}$ and $Cl^{-}$ is $x \, pm$. What is the edge length of the unit cell?

$A$ 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?

Which of the following is correct for the crystal lattices mentioned below?

What is the total volume occupied by atoms in a face-centered cubic $(FCC)$ unit cell of a metal?

Total volume of atoms present in a face-centred cubic unit cell of a metal is ($r$ is atomic radius)

The crystal structure of $AB$ is of $NaCl$ type. If the radius of the $A^+$ ion is $x \ pm$ and the radius of the $B^-$ ion is $y \ pm$, then the edge length of the unit cell will be ..........