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

In the rock salt structure,the number of formula units per unit cell is equal to

In a diamond crystal,each carbon atom is linked with other carbon atoms. The number of carbon atoms in a diamond unit cell 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

What is the number of atoms present in the unit cells of a simple cubic,body-centered cubic,and face-centered cubic lattice of a monoatomic substance,respectively?

In a $ZnS$ type crystal,state the coordination number and the position of the cation.