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Question

Crystalline substances are made of :

A
a three-dimensional repeating design formed by smaller identical units
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B
individual crystals
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C
a two-dimensional repeating design made from smaller identical units
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D
a three-dimensional design made from smaller identical units that do not repeat
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E
none of these
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Solution

The correct option is B a three-dimensional repeating design formed by smaller identical units
A crystal is a solid material whose constituents are arranged in a highly ordered microscopic structure. The atoms in crystals are arranged in a regular, repeating pattern.

Hence the correct option is A.

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