Tag Archives: Metallic solid

Classification of Crystalline Solids

In this topic, we have to discuss the types of crystalline solids. Crystalline solids are classified into four categories as follows:

1. Molecular solids: Solids whose constituent particles are molecules are called molecular solids.

Molecular solids are of three types:

I. Non-polar molecular solids: A solid in which the constituent particles are held by weak dispersion forces or London forces are called non-polar molecular solids.

Ex: H2, O2, N2, Noble gases like He, Ne, Ar, Kr etc

II. Polar molecular solids: A solid in which the constituent particles are held by dipole-dipole forces is called a polar solid.

Ex: HCl, NH3, SO2 etc

III. Hydrogen bonded molecular solids: A solid in which the constituent particles are held by Hydrogen bond is called a hydrogen bonded molecular solids.

Ex: Ice, HF etc

2. Covalent or network solids: A solid in which the constituent particles form a huge network of very strong covalent bonds is called a covalent or network solid.

Ex: Diamond, Graphite, Silica, Silicon Carbide etc.

3. Ionic solids: A solid whose constituent particles are ions is called an ionic solid.

Ex: NaCl, MgCl2 etc

4. Metallic solids: A solid whose constituent particles are atoms of a metal is called a metallic solid.

Ex: Fe, Cu, Zn etc.

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