CHM 11500 Lecture Notes - Lecture 27: Cubic Crystal System, Sodium Chloride

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CHM 155 - Lecture 27 - Crystal Structures
Crystalline Solids
When many liquids cool, they freeze to form crystalline solids
Crystalline solids are solids in which the particles are arranged in a definite
repeating pattern
Some crystalline solids consist of one crystal (such as diamonds or salt particles)
while other crystalline solids are conglomerations of many crystals (such as
chunks of ice or metals)
Amorphous solids are the opposite of crystalline solids: their particles do not
move readily while freezing and so become frozen in random positions resulting
in a disordered internal structure
Amorphous solids include glass, wax, and plastics
There are several types of crystalline solids:
Unit Cells
A unit cell is the repeating unit that creates the organized pattern present in a
crystalline solid
A space lattice is “the collection of all the points in a crystal that have identical
environments”
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The unit cell is the portion of the space lattice that will generate the entire lattice if
repeated
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