Question

What are the four types of crystalline solids?

Answer 1

Crystalline solids

Crystalline solids are solids which have regular ordered arrangement of components held together by uniform intermolecular forces.

The four types of crystalline solids are:

Ionic solids

1. Solids composed of cations and anions hold together by electrostatic force.
2. Eg: Any metal and non metal bonds,$\left(\mathrm{NaCl},\mathrm{CuO}\right)$

Molecular solids

1. Solids composed of discrete molecules held together by electrostatic force.
2. Eg: When non-metal freezes into solids $\left({\mathrm{H}}_2\mathrm{O},{\mathrm{I}}_2,{\mathrm{C}}_3{\mathrm{H}}_7\mathrm{OH}\right)$

Network covalent solids

1. Solids composed of atoms covalently bonded into layers of two-dimensional networks or into a three-dimensional network.
2. Eg: Only includes $\mathrm{Diamond}\left(\mathrm{C}\right),\mathrm{Graphite}\left(\mathrm{C}\right),{\mathrm{SiO}}_2,\mathrm{WC}$

Metallic solids

1. Solids composed to metal cations held together by delocalized valence electrons.
2. Eg: Any pure metal $\left(\mathrm{Na},\mathrm{Fe},\mathrm{Al},\hspace{0.17em}\mathrm{Cu}\right)$