In a hexagonal close packing $(hcp)$ lattice,each sphere touches ................... spheres in its own layer.

Which of the following has a $4:2$ coordination number structure?

Predict the close-packed structure of an ionic compound $A^{+} B^{-}$ in which the radius of cation and anion are $148 \ pm$ and $195 \ pm$ respectively.

In an $fcc$ structure,the location of the octahedral void is at ........

Number of atoms per unit cell for body centered cubic system is

Which of the following structures is not correctly matched?