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Ch.12 - Solids and Modern Materials
Brown - Chemistry: The Central Science 15th Edition
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Tutti i libri di testoBrown 15th EditionCh.12 - Solids and Modern MaterialsProblema 14a
Capitolo 12, Problema 14a

Which type (or types) of crystalline solid is characterized by each of the following? (a) High mobility of electrons throughout the solid;

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Identify the key characteristic given in the problem: 'High mobility of electrons throughout the solid.'
Understand that the mobility of electrons suggests that the electrons can move freely within the structure of the solid.
Recall that in crystalline solids, the arrangement and bonding of the atoms, ions, or molecules determine their properties.
Recognize that the free movement of electrons is a characteristic of metallic solids, where electrons are delocalized and can move freely throughout the metal lattice.
Conclude that the type of crystalline solid characterized by high mobility of electrons throughout the solid is a metallic solid.

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Crystalline Solids

Crystalline solids are materials whose constituents, such as atoms or molecules, are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions. This ordered arrangement gives rise to distinct physical properties, including specific melting points and anisotropic behavior, where properties vary based on direction within the crystal.
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Crystalline Solids Structure

Electrical Conductivity

Electrical conductivity refers to the ability of a material to conduct electric current. In solids, this property is largely determined by the presence of free-moving charge carriers, such as electrons. Materials with high electrical conductivity, like metals, allow electrons to move freely, facilitating the flow of electricity throughout the solid.
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Extensive Property Example

Types of Crystalline Solids

Crystalline solids can be categorized into different types based on their bonding and structure, including ionic, covalent, metallic, and molecular solids. Metallic solids, characterized by a 'sea of electrons' that allows for high mobility of electrons, are particularly noted for their excellent electrical conductivity, distinguishing them from other types of crystalline solids.
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