Types of Solid – Class 12 | Chapter – 1 | Chemistry Short Notes Series PDF for NEET & JEE
Types of Solid: The types of solids depend on their bonding, structure, and properties, and have important implications for their applications in various fields. There are several types of solids, classified based on their bonding and arrangement of constituent particles.
Types of Solid
The main types of solids are:
- Crystalline solids: These are solids with a well-defined, ordered, and repetitive arrangement of constituent particles such as atoms, molecules, or ions. They have a specific crystal structure and characteristic physical properties such as sharp melting points and anisotropy. Examples of crystalline solids include metals, ionic crystals, covalent crystals, and molecular crystals.
- Amorphous solids: These are solids with a disordered arrangement of constituent particles such as atoms, molecules, or ions. They lack a specific crystal structure and have isotropic physical properties such as no sharp melting points, low tensile strength, and high viscosity. Examples of amorphous solids include glass, rubber, and plastics.
- Molecular solids: These are solids composed of discrete molecules held together by weak intermolecular forces such as van der Waals forces, hydrogen bonding, or dipole-dipole interactions. They have low melting points and are often soft and brittle. Examples of molecular solids include solid carbon dioxide (dry ice), iodine, and naphthalene.
- Covalent network solids: These are solids with a three-dimensional network of covalent bonds between constituent particles such as atoms or ions. They have high melting points, are often hard and brittle, and have excellent thermal and electrical conductivity. Examples of covalent network solids include diamond, silicon, and silicon carbide.
- Metallic solids: These are solids composed of metal atoms held together by metallic bonds, which are a type of delocalized bonding. They have high thermal and electrical conductivity, are ductile and malleable, and have lustrous surfaces. Examples of metallic solids include copper, silver, and iron.
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