The number of $Cl^{-}$ ions around one $Na^{+}$ in $NaCl$ crystal lattice is

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

Identify the unit cell from the following that contains four particles in it.

In solid $CsCl$,each $Cl^{-}$ ion is closely packed with how many $Cs^{+}$ ions?

An example of a body-centered cubic $(BCC)$ crystal structure is:

An element has a body-centered cubic $(BCC)$ structure with an edge length of $288 \ pm$. The density of the element is $7.2 \ g/cm^3$. How many atoms are present in $208 \ g$ of the element?