Learning Exercise

Content: A. Periodic table 1. review trends in periodic table a. electronegativity, ionization energy, valence electrons, atomic size 2. talk about stable configurations 3. properties of particular groups a. halogens b. alkalis B. Types of chemical bonds 1. ionic 2. covalent C. Lewis Dot structures 1. duet rule and octet rule Instructional Activities: (1) 1. Begin by showing a cartoon with scientists. (2) 2. Put up Slide 1 (Objective)-A student will paraphrase the objective (3) 3. Distribute candy atomic and molecular components. (3) 4. Put up Slide 2-show trends in periodic table (5) 5. Put up Slide 3-talk about stable electron configurations; have students build candy atoms with filled and unfilled electron shells (1) 6. Put up Slides 4 and 5-discuss animations/diagrams of ionic and covalent bonding (10) 7. Using slides and diagrams, show students how to make physical models of simple molecules. Focus on NaCl, H2, and CH4. Relate these structures to Lewis Dot Structures. (1) 8. Close by summarizing the bonding types and talking how they fit with trends in periodic table. Say that we will build on this in the next lecture with more complicated structures. (2) 9. Evaluate by asking different students to predict the behavior and molecular formulas of metals and nonmetals we have not talked about.