The coordination number of each sphere in hexagonal close packing is …….. While that of body -centred cubic packing is…..

The empty space in the hexogonal close packing is……..% while that in the body-centred cubic packing is ………%

What is the coordination number of each atom in a hexagonal close-packed solid?

The coordination number of the spheres in the two dimensional hexagonal close packing is _________.

What is the co-ordination number of each sphere in (i) Hexagonal close packed structure. (ii) Cubic close packed structure. (iii) Body centred cubic packed structure.