Chapter 12: Solids & Modern materials Dr. Aimée Tomlinson Chem 1212

Classification, Crystalline, and Amorphous Solids Sections 12.1-12.2 Classification, Crystalline, and Amorphous Solids

Two Main Types of Solids Crystalline Solids Have a cubic array of tightly packed atoms or molecules Ionic Solids Composed of cations/anions Atomic Solids Composed of a single atom Molecular Solids Composed of molecules http://www.personal.kent.edu/~cearley/ChemWrld/jmol/crystals/NaCl3d.png Copyright Oliver Kreylos, Center for Image Processing and Integrated Computing (CIPIC), University of California, Davis. commons.wikimedia.org/wiki/File:Hex_ice.GIF Amorphous: Are complete disordered and have no repeat unit www.flickr.com/photos/pa-i_ki-i/2494130750/

Metallic Solids lattice: refers to the 3D array of particles in a crystalline solid lattice points: are the points of array that are occupied by a particle unit cell: basic repeating unit of the particle arrangement in a crystalline solid Three types of solid arrangements: X 3 Simple Cubic Body-Centered Cubic Face-Centered Cubic www.meatfighter.com/puls/ http://matdl.org/repository/eserv/matdl:829/web_wiki2fez2437.jpg * 8 corners + 6 faces * 1/2 for face * 8(1/8) + 6(1/2) = 4 http://explorepdx.com/oneshot.jpg * 8 corners + 1 body * 1 for body * 8(1/8) + 1= 2 * 8 corners * 1/8 for ea. * 8(1/8) = 1 One atom present in cube Two atoms present in cube Four atoms present in cube

Section 12.3-12.9 Skip – YIPPEE!!!