What is the number of unit cells in one mole of an atom of a metal that forms a simple cubic structure?

In a hexagonal close packing $(hcp)$ lattice,each sphere touches ................... spheres in its own layer.

If all ions touching an axis passing through two opposite face-centres of unit cell are removed in $NaCl$ (rock salt) structure in which $Cl^{-}$ ions form $CCP$ and $Na^{+}$ ions occupy all octahedral voids,then the effective number of $Cl^{-}$ ions per unit cell is:

In $FCC$ lattice,alternate tetrahedral voids are occupied in which of the following?

Which type of cubic lattice has the maximum number of atoms per unit cell?

Copper crystallises in a face-centred cubic lattice with a unit cell length of $361 \text{ pm}$. What is the radius of copper atom in $\text{pm}$?