Caluclation of number of atoms in different types of unit cells

How is simple cubic unit cell formed ? Calculate the number of atoms in a simple unit cell.

Na and Mg crystallize in bcc- and fcc-type crystals, the ratio of number of atoms present in the unit cell of their respective crystal is

HCP unit cell number of atoms

The coordination number of each atom in body centered cubic unit cell is

InABC ABC packing if the number of atoms in the unit cell is n then the number of tetrhedral voids in the unit cell is equal to

the correct order of the packing effeciency in different types of unit cells is ……….. .

The correct order of the packing efficiency in different types of unit cells is______________