1. Introduction to Bonding

2. Overview: Types of Bonds 3 bond types : ionic, covalent, and metallic In ionic bonding one atom has a stronger attraction for electrons than the other, and “steals” an electron from a second atom. Oppositely charged ions stick together. In covalent bonding the attraction for electrons is similar for two atoms. They share their electrons to obtain an octet In metallic bonds, electrons in metals are delocalized electrons, not tied to a particular nucleus. ionic covalent metallic

3. Predicting Bond Type and Bond Properties Metal – Nonmetal: Ionic Bond Forms a Salt = network solid or crystal A very strong bond Expressed as a formula unit

4. Predicting Bond Type and Bond Properties Nonmetal – Nonmetal: Covalent bond Forms a Molecule A weaker bond Expressed as a chemical formula Methane, CH 4 Water

5. Predicting Bond Type and Bond Properties Metal - Metal: Metallic bond Forms an Alloy A mixture of metals with delocalized electrons

6. Bond Identification Practice A) ionic, B) covalent, or C) metallic? 1) MgO2) CaCl 2 3) SO 2 4) PbCl 2 5) CCl 4 6) CH 4 7) AuCu

7. Bond Identification Practice A) ionic, B) covalent, or C) metallic? 1) MgO(ionic), 2)CaCl 2 (ionic),3) SO 2 (covalent), 4) PbCl 2 (ionic),5) CCl 4 (covalent), 6) CH 4 7) AuCu (metallic) (covalent),