Unit#5ChemicalComposition参考模板范本.doc

Unit # 5: Chemical Composition(Chapters 7 and 8)I. “Intra-Chemical” BondingA. Definition: atoms (elements) held together by an _B. Types (3)1. Metallic: atoms of a metal _ the valence electrons because they _ 2. Ionic (strongest)a. Definition: electrons are _from one element to another (opposite charges is attractive force)b. Called: _