The unit cell of an element of atomic mass 96, and density 10.3 g cm–3 is a cube with edge length of 314 pm. Find the structure of crystal lattice (simple cubic, F.C.C. or B.C.C.) Avogadro’s constant. NA = 6.023 x 1023 mol–1?
solution: we have given
Density of element, Cell edge a= 314pm or 3.14 x 10-10 cm
The structure of the crystal lattice is B.C.C.
Why are solids rigid?
Solids are rigid because the internuclear distance between the molecules of a solid are very less and closely packed and their positions are fixed due to the strong forces of attraction between them.