10. Which of the following describes a crystalline solid? a. Crystalline solids have particles that are not arranged in a regular geometric pattern. b. Crystalline solids melt over a wide range of temperatures. c. Crystalline solids have particles that are arranged in a regular geometric pattern. d. Some crystalline solids are soft.

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Crystal Structures

Solids are present all around us. They have different properties and applications. Diamond and graphite are two well-known solids. Diamond is the hardest material in the world and is used in making jewelry. Graphite on the other hand is soft. The lead of your pencil is graphite. Why are they so different in appearance and properties despite the fact they are chemically the same? Both are allotropes of carbon. The answer lies in the structure, the way constituent particles are arranged in the solids.