Packing in Solids

The lattice generated in three-dimensional closed packing from two-dimensional square close-packed layers is

The coordination number for molybdenum in hexagonal closed packing is 

The coordination number in one-dimension close packing is 

The lattice generated in three-dimensional closed packing from two-dimensional square close-packed layers is

Two dimensions coordination number of a molecule in square close-packed layers is

How many unit cells are present in a cube shaped ideal crystal of $\mathrm{NaCl}$ of mass $1\mathrm{g} ?$

Atoms of an element $\mathrm{Z}$ form hexagonal closed packed $\left(\mathrm{hcp}\right)$ lattice and atoms of element $\mathrm{X}$ occupy all the tetrahedral voids. The formula of the compound is

All noble gases crystallise in the ccp structure except

The space occupied by $\mathrm{BCC}$ arrangement is approximately

Co-ordination number of atoms in $\mathrm{HCP}$is:

In any compound, atoms of $\mathrm{A}$ occupies in $\mathrm{HCP}$ packing and atoms of $\mathrm{B}$ is at $\frac{1}{3^{\mathrm{rd}}}$ of tetrahedral voids. Then empirical formula of compound is:-

In any compound, atom $\mathrm{B}$ occupies in $\mathrm{HCP}$ packing and $\mathrm{A}$ is $1/3^{\mathrm{rd}}$ of tetrahedral voids. Then empirical formula of compound is:-

$\mathrm{HCP}$ crystal in made of $\mathrm{A}$ ions and $\mathrm{B}$ ions are arranged in $2/3^{\text{rd }}$ of octahedral voids. The simplest formula of unit cell is
 

In a cubic close packed structure of mixed oxides, the lattice is made up of oxide ions, one eighth of tetrahedral voids are occupied by divalent $\left({\mathrm{X}}^{2+}\right)$ ions, while one-half of the octahedral voids are occupied by trivalent ions $\left({\mathrm{Y}}^3+\right),$ then the formula of the oxide is:-

What is the relation between edge length $\mathrm{a}$ and radius of an atom $\mathrm{r}$ in $\mathrm{HCP}$ unit cell?

How many number of edges are present in an $\mathrm{HCP}$ unit cell?

If $\mathrm{ABAB}$... type arrangement is called $\mathrm{HCP}$ type packing, then $\mathrm{XYXY}$... type arrangement is called?

The number of atoms present in a hexagonal close packed unit cell is: 

A compound of formula ${\mathrm{A}}_2{\mathrm{B}}_3$ has the $\mathrm{hcp}$ lattice. Which atom forms the $\mathrm{hcp}$ lattice and what fraction of tetrahedral voids are occupied by the other atoms

In the hexagonal closest packed structure of a metallic lattice, number of the nearest neighbours of a metallic atom is