Types of Crystel, Close packing and Defects

Close Packing In 3d

Summary|Close Packing

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

Close Packing In 1d And 2d

Close Packing|Summary

2D and 3D closed packing

Close packing in Crystal||1-D Close Packing

Identical spheres are undergoing two-dimensinal packing in squre close packing and hexagonal close packing. Which is correct regarding the spheres?

Which one of the following schemes of ordering closed packed sheets of equal sized spheres does not generate close packed lattice