What are the three basic types of solids and the composite units of each? What types of forces h

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What are the three basic types of solids and the composite...

Key Concepts

Molecular Solids

Molecular solids are composed of discrete molecules that retain their identity within the solid. These structures are held together by relatively weak intermolecular forces, such as London dispersion forces, dipole–dipole interactions, or hydrogen bonding, rather than strong covalent or ionic bonds. This results in lower melting and boiling points compared to other types of solids and gives them unique physical properties like softness and low thermal conductivity.

Ionic Solids

Ionic solids are built from a repeating array of positive and negative ions arranged in a crystal lattice. The composite units are the individual ions, and the structure is stabilized by the strong electrostatic forces (ionic bonds) between oppositely charged ions. This arrangement produces high melting points, significant hardness, and brittleness, as the directional nature of the ionic bonds causes the structure to shatter when stressed.

Network (Giant Covalent) Solids

Network or giant covalent solids consist of atoms connected in a continuous network via covalent bonds, meaning there are no discrete molecular units in the structure. The strong, directional covalent bonds extend throughout the entire solid, which imparts exceptional hardness, very high melting points, and often excellent thermal conductivity. This extended bonding framework defines materials such as diamond and quartz.

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