The number of carbon atoms per unit cell of diamond unit cell is

$A$ unit cell of calcium fluoride has four calcium ions. The number of fluoride ions in the unit cell is

Potassium crystallizes in a $bcc$ lattice,hence the coordination number of potassium in potassium metal is

In a face centred cubic lattice,atom $A$ occupies the corner positions and atom $B$ occupies the face centre positions. If one atom of $B$ is missing from one of the face centred points,the formula of the compound is:

The coordination number for $Cu$ (Copper) in its crystal structure is:

Potassium fluoride $(KF)$ has an $NaCl$ type structure. What is the distance between $K^{+}$ and $F^{-}$ ions if the unit cell edge length is $a \ cm$?