2500 He 2000 Ne 1500 H. 1000 N. Ar CI 500 Be Kr LI Si Br Mg As Se Na AI Ge Ca Ga Period 1A 2A 3A 4A SA 6A 7A BA Group First ionization energy (KJlmol)

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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.