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Types of Solids

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Estimated time: 5 minutes
Maharashtra State Board: Class 12

Key Points: Types of Solids

Property Crystalline Solids Amorphous Solids
Arrangement of particles Regular, ordered Random, disordered
Melting point Sharp Not sharp (melts over a range)
Optical behaviour Anisotropy (properties differ with direction) Isotropy (same in all directions)
Examples NaCl, Fe Glass, Rubber

Amorphous solids are also known as supercooled liquids.

Isomorphism and Polymorphism:

Term Meaning Example
Isomorphism Two or more substances having the same crystal structure (same atomic ratio) NaF & MgO (1:1); NaNO₃ & CaCO₃ (1:1:3)
Polymorphism A single substance existing in two or more crystalline forms Calcite & aragonite (CaCO₃); α-quartz, β-quartz, cristobalite (SiO₂)
 

Polymorphism occurring in elements is called allotropy.

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