The number of atoms contained in one face-centred cubic $(FCC)$ unit cell of a monoatomic substance is:

Number of next nearest ions around $Na^{+}$ in $NaCl$ unit cell is $X$ and number of next nearest ions around $Cs^{+}$ in $CsCl$ unit cell is $Y$. The value of $X - Y$ is

In a $BCC$ lattice containing $X$ and $Y$ type of atoms, $X$ type of atoms are present at the corners and $Y$ type of atoms are present at the body center. In its unit cell, if three atoms are missing from the corners, the formula of the compound is:

The ionic radii of $A^{+}$ and $B^{-}$ ions are $0.98 \times 10^{-10} \ m$ and $1.81 \times 10^{-10} \ m$. The coordination number of each ion in $AB$ is.......

What is the coordination number of any particle in the $fcc$ (face-centered cubic) crystal lattice?

If the edge length of a cubic unit cell is $a$,then the octahedral void is located at a distance of ....... from the corner of the cube.