The discussion of solids continued with close packed arrangements of spheres. Particles in solids pack in the most efficient manner to minimize empty space. To illustrate this I used material from the Structures of Solids lab, which is posted on Carmen. Be sure to look through these figures and try to envision the structures in 3 dimensions. Be sure to highlight the sections I pointed in class in your preparation for the exam. In terms of the various packing arrangements I summarized all pertinent information in a table. Be sure to see how these formulas and numbers are derived from the packing of atoms/ions in a structure. Section 11.8 touches on the unit cells of ionic compounds and compares and contrasts the different bonding interactions in solids and the structures resulting from this bonding. At the end of lecture I discussed Lab #15.
An Excellent tutorial on the structures of solids can be found here. Be sure to check it out to gain a deeper appreciation for the 3-Dimensionality of the structures of solids.
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