Question

a) What is crystalline solid?
b) Write down the optical properties of a solid.
(c) Write down the name of seven crystal system.
(d) In an NaCl crystal, the equilibrium distance (r.) between ions
is 0-281 mm. Find the potential energy per ion pair. (Given,
the Medalung constant a = 1.748 and n=9)​

Answer 1

Hope this attachment will help you :)

Answer 2

Explanation:

Atoms arrange themselves in a lattice to form a crystal because of a net attractive force between their constituent electrons and atomic nuclei. The crystals formed by the bonding of atoms belong to one of three categories, classified by their bonding: ionic, covalent, and metallic. Molecules can also bond together to form crystals; these bonds, not discussed here, are classified as molecular. Early in the twentieth century, the atomic model of a solid was speculative. We now have direct evidence of atoms in solids