CHEM 110 Lecture Notes - Lecture 10: Inert Gas, Lattice Energy, Nonmetal
Document Summary
Ionic- e- are transferred to form separate ions. Covalent- e- are shared between nuclei and form distinct molecules. Metallic- e- are shared among all nuclei. Octet rule- elements gain/lose/share e- to develop an inert gas e- configuration. Low conductivity as solids; high conductivity as liquids. Coulomb"s law e= q q d. There is e when ionic solids separate into ions in the gas phase (lattice energy) Born-haber cycle- calculate lattice energy using atomic properties. Trends are explained by coulomb"s law (charge and size) Higher charge and shorter distance = stronger bond. Ion size is important in determining lattice energy. Larger in size means higher in energy. Melting point is directly proportional to le (bond strength) Distance which is based on the size of the ions (farther distance = lower mp) Ionic- consists of a + and - ion.
