Packing The 3rd Layer Over 2nd Layer:-HCP & CCP Structure Analysing

Which of the following statements are correct - 1. CCP structure has three different type of layers. 2. In CCP structure, first and fourth layers are repeated. 3. In an HCP structure, first and fourth layers are repeated. 4. In FCC packing, the neighboring face centered atoms touch each other.

Packing Efficiency|Packing Efficiency In CCP Structures|Packing Efficiency In Simple Cubic Lattice|Summary

Total number of T-voids and O-voids in HCP and CCP structures are different . (True/False)

While placing the second layer over that first layer , if the sphere of the second layer is above the void of the first layer, the void formed is

When over a two-dimensional square packing same layers are kept in the way so that the centers are alligned in all three dimensions, coordination number of each sphere is

3D Close Packing || Formation OF Triangular void after Placing First (A) Layer || Formation OF Tv and Ov after Placing Second (B) Layer, ABAB.... || type OF Packing - HCP (Z,CN) || Packing Fraction OF Unit Cell || Volume OF Atoms and unit Cell