Lecture 21 - Solids Chem 172 Advanced Inorganic Chemistry...

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1 Chem 172 Advanced Inorganic Chemistry Lecture 23/May 26 th Crystalline Solid Crystal Lattice Structure Solids • Solids can be categorized as either crystalline or amorphous • Crystalline solids have a well defined shape because their particles occur in an orderly arrangement • Amorphous solids have poorly defined shapes because their particles lack orderly arrangements Crystal Lattice and the Unit Cell ± Crystal lattice – An array of points that defines the position of particles in a crystal structure. ± Unit Cell – The smallest section of a crystal that if repeated in 3 dimensions would produce the crystal ± Coordination number – the number of nearest neighbors surrounding a particular particle 7 Crystal Systems 7 crystal systems and 14 types of unit cells are found in nature 7 Crystal Systems 7 crystal systems and 14 types of unit cells are found in nature Cubic System 3 types of cubic unit cells within the system ± Simple cubic – 8 particles define the corners of a cube, touching along the edges but not diagonally. Coordination number of each particle = 6
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Lecture 21 - Solids Chem 172 Advanced Inorganic Chemistry...

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