Crystalline solids and amorphous solids | ch#5 | 9th Class chemistry

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5.5 Types of Solids
According to their general appearance solids can be classified into two types:
amorphous solids and crystalline solids.
5.5.1 Amorphous Solids
Amorphous means shapeless. Solids in which the particles are not regularly
arranged or their regular shapes are destroyed, are called amorphous solids. They do
not have sharp melting points. Plastic, rubber and even glass are amorphous solids as
they do not have any sharp melting points.
5.5.2 Crystalline Solids
Solids in which particles are arranged in a definite three-dimensional pattern
are called crystalline solids. They have definite surfaces or faces. Each face has definite
angle with the other. They have sharp melting points. Examples of crystalline solids are
diamond, sodium chloride, etc.
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