Define the following terms and answer the associated questions :
Crystal : Give an example of a crystalline solid and state how it differs from an amorphous solid.

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Solution

Crystal :
A crystal is defined as a homogenous solid in which particles ( atoms, molecules or ions ) are arranged in the definite pattern due to which they have a definite geometrical shape with plane surfaces. For example, sugar and sodium chloride crystals.
$Amorphous solids$ $Crystalline solids$
$They have no ordered structure .$ $They possesses highly ordered structure .$
$They have no definite melting points .$ $They have fixed melting points$
$They are less rigid$ $They are more rigid$
$Examples are glass, waxes, plastic, etc .$ $Examples are diamond, metals, table salts, etc .$

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$Amorphous solids$	$Crystalline solids$
$They have no ordered structure .$	$They possesses highly ordered structure .$
$They have no definite melting points .$	$They have fixed melting points$
$They are less rigid$	$They are more rigid$
$Examples are glass, waxes, plastic, etc .$	$Examples are diamond, metals, table salts, etc .$