01:160:161 Lecture Notes - Lecture 12: Well-Order, Intermolecular Force, Sodium Chloride
12 Dec 2018
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Document Summary
Unlike gases or liquids, particles of a solid are in very close contact with each other and have relatively no mobility. Particles are arranged in well-ordered three-dimensional lattices and have regular ordered structure. The regular arrangement of particles within a crystalline solid. The reason why substances have different lattices is because particles arrange themselves so as to best minimize their energy. Depends on if their atoms, ions, size, etc. The smallest collection of particles (atoms, ions, molecules) that, when repeated in all three dimensions, reproduces the entire crystalline lattice of the solid. Different unit cells give rise to different crystalline lattices. Related to the radii of the particles making up the unit cell. There are different mathematical relationships between the atom"s radius and (l) that depend on the specific type of unit cell. For cubic unit cells, all lengths are equal and all angles = 90 degrees. Total number of particles that belong solely to one unit cell.
