What is the criterion for clean glassware? Select one: O a. no water droplets adhere to the clean part of the glassware O b. clean glassware should have water droplets adhering to its inner wall c. clean glassware has residual chemicals that could potentially effect the outcome of an experiment

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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.