closest packing in 3d

The difference in coordination numbers of hexagonal close packing in 3D and square close packing in 2-D, of identical spheres is:

If the anions (A) form hexagonal closest packing and cations (C ) occupy only 2/3 octahedral volids in it, then the general formula of the compound is:

If the anions (A) form hexagonal closest packing and cations (C) occupy only 2/3 octahedral voids in it. Then the general formula of the compound is

Calculate the void space in closest packing of n spheres of radius 1 unit, n spheres of radiys 0.414 units, and 2n spheres of radius 0.225 units.

In the closest packing of atoms

In the closest packing of atoms

In the closest packing of is N atoms . There are

The unit cell present in ABAB, closest packing of atoms is: