Solid State Tes...

Crystal $$AB$$ shows $$ZnS$$ (zinc blend) type structure if the radius of $$B^{-}$$ in $$50\ pm$$ then the radius of $$A^{+}$$, if edge length of unit cell is $$160\ pm$$.

If the same type of atoms are packed in hexagonal closest packing (hcp) and cubical closest packing(ccp) separately, then: 

$$KF$$ has $$NaCl$$ structure. The edge length of its unit cell has been found to be $$537.6\ pm$$. The distance between $$K^{+}$$ and $$F^{-}$$ in $$KF$$ is :

A metallic element exists as cubic lattice. Each edge of the unit cell is $$  2.88 \mathring {A} .$$ The density of the metal is $$ 7.20\ g cm^{-3}.$$ How many unit cell will be present in 100 g of the metal?

Which of the following solids have tetragonal crystal system

In orthorhombic, the value of $$a, b$$ and $$c$$ are respectively $$4.2\ A$$, $$8.6\ A$$ and $$8.3\ A$$.Given the molecular mass of the solute is $$155\ gm\ mol^ {-1}$$ and that of density is $$3.3\ gm\ cc$$ the number of formula units per unit cell is

How many types of crystalline solids are found?

Packing fraction in diamond is (approximately)

Packing fraction in $$2D-$$hexagonal arrangement of identical sphere is 

The density of nickel (face centered cubic cell) is $$8.94\ g/cm^3$$ at $$20^oC$$. What is the radius of the atom? (Atomic weight: $$Ni=59$$)