The available space occupied by spheres of equal size in three dimensions in both hcp and ccp arrangement is

Empty space left in HCP in three dimension is

The space occupied by spheres in bcc arrangement is

The space occupied by spheres in bcc arrangement is

The percentage of the available space occupied in a hexagonal close packing of spheres in three dimensions is

The empty space within hcp arrangement is

The coordination number of spheres in hcp lattice in three dimension is

Give one property common to both hcp and ccp crystal lattices.