In a closed packed structure

What is the coordination number in a single plane of a closed packed structure ?

Coordination number in a square close packed structure and hexagonal close packed structure respectively are

Which of the following statements is/are not correct for a close - packed structure ?

Do all metals posses a closed packed structure?

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.

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.

What do you understand by a tetrahedral void in a close-packed structure of a crystal? What is the relation between the number of tetrahedral voids and the number of packed particles in a close-packed structure of particles?