Solid State Tes...

Packing fraction in FCC lattice is

Sodium oxide as anti-fluorite structure. The percentage of the tetrahedral voids occupied by the sodium ions is

Consider the bcc unit cells of the solids $$1$$ and $$2$$ with the position of atoms as shown below. The radius of atom $$B$$ is twice that of atom $$A$$. The unit cell edge length is $$50 \%$$ more in solid $$2$$ than in $$1$$. What is the approximate packing efficiency in solid $$2$$?

Iodine molecules are held in the crystal lattice by?

In $${Na}_{2}O$$ structure

Frenkel defect is noticed in 

Which void is smallest in close packing?

If the unit cell length of sodium chloride crystal is $$600pm$$, then its density will be

An alkali metal has density $$4.5g/{ cm }^{ 3 }$$. It has cubic unit cell with an edge length $$400pm$$. Reaction of $$7.68{ cm }^{ 3 }$$ chunk of the metal with an excess of $$HCl$$ solution gives a colorless gas that occupies $$4.54L$$ at $${0}^{o}C$$ and $$1$$ bar. The unit cell of metal is

A solid element (monoatomic) exists in cubic crystal. If its atomic radius is $$1.0\mathring { A } $$ and the ratio of packing fraction and density is $$0.1{cm}^{3}/g$$, then the atomic mass of the element is $$\left( { N }_{ A }=6\times { 10 }^{ 23 } \right) $$