Solids (2/8/16) Cem 152 (P. Hunt)
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This 2 page Class Notes was uploaded by JessicaJ on Monday February 8, 2016. The Class Notes belongs to Cem 152 (P. Hunt) at Michigan State University taught by P. Hunt in Spring 2016. Since its upload, it has received 72 views. For similar materials see Principles of Chemistry in Chemistry at Michigan State University.
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Date Created: 02/08/16
Solids Monoclinic A≠B≠C o α=δ=90° o β≠90° o Primitive o Body centered (Fe, Cr, Na) o Face centered (Al, Aq, Pb, Au) Metallic Solids o Entirely metal atoms o Marked by high conductivity (thermal & electrical) o Malleable ~ hammer flat o Ductile ~ pull into wire o Crystals Put atoms of metallic solid on the lattice points combination number - # of equal distant nearest negations of an atom o Hexagonal close pairing (hcp) o Cubic close pairing (ccp) 12 in both cases Volume occupied in Packing Efficiency = Volume (total) in unit cell 1. Function of an atom in the cell Inside cell = 1 FCC Corner Cell = 1/8 8 corners x 1/8 = 1 atom Face = ½ 6 faces x ½ = 3 atoms Edge = ¼ 1 + 3 atoms = 4 atoms 2. Information found here 3. Edge length Close packing spherical electron clouds of the atoms are tangent to each other 45 4 4. Volume occupied by 4 spherical atom 3 3 4 x (4/3πr ) = 16/3 πr 3 3 5. Volume of Cube = (2sqrt(2)r) = 16sqrt(2)r 6. Efficiency of packing (16/3 πr ) / (16sqrt(2) r ) = π / (3sqrt(2)) = 74%
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