CHEM 167 Lecture Notes - Lecture 8: Zirconium, Molar Mass, Constant Contact
Document Summary
Crystalline solids : atoms or molecules assumes a regular, repeating geometric arrangement. Packing efficiency: percentage of space in arrangement. Amorphous solids : atoms or molecules assume a random arrangement. Z is the number of formula units (atoms in the present case) in the cubic unit cell. A unit cell is the smallest collection of atoms that displays all the features of the crystal structure. The number of atoms immediately adjacent to any given atom. Simple cubic has a coordination of 6. Body-centered cubic has a coordination number of 8. Ccp & hcp = 12 cn ((anti)cuboctahedron) Malleable - worked into useful shapes or foils. The bonding in metals can"t be explained in terms of ionic or covalent bonding. Valence electrons are delocalized and move freely throughout the solid. Explains malleability, ductility, and conductivity properties of metals. A lot of heat must be provided to generate significant conductivity.
