1. Metallic Bonds and Properties of Metals AHSGE Reading 2.3 Determine cause and effect. AHSGE Reading 4.3 Discern organizational patterns. Other AOD C.3.2 Recognize periodic trends of elements, including the number of valence electrons, atomic size, and reactivity.

2. What are some properties of Metals?

3. Metallic Bonds  Electron sea model: all the metal atoms in a metallic solid contribute their valence electrons to form a “sea” of electrons  These electrons are free to move from atom to atom (delocalized electrons).  Metallic bonds form from the attraction of a metallic cation(??) for the delocalized electrons

4. Metal Alloy  Def.: a mixture of elements that has metallic properties  Examples:  Steel is iron + at least one other element  Brass is copper + zinc  Assignment: Workbook (p.48)