1. Bonding…..

2. Warm up: • Draw the Lewis Dot Structure for: what is the charge (Oxidation number)? LD Charge • C ____ _____ • O ____ _____ • S ____ _____ • B ____ _____

3. Ionic Bonds and Ionic Compounds • Ionic Bonds: the attraction between cations and anions that results from the giving and taking of electrons to meet the octet rule. • Reminder: What is the octet rule? What are IONS??

4. Ionic bonding • Cation: Positive Ion • Anion:Negative Ion • Ionic Compound:a compound held together by ionic bonds with a net zero charge.

5. Illustrating an ionic bond • Part 1: • Give the dot structures for each element. • Show the giving/taking of electrons. • Keep adding atoms until all have met the octet rule. Na and Cl

6. Illustrating an ionic bond • Part 2: • Summarize the number and charge of each cation and anion Na+ and Cl-

7. Illustrating an ionic bond • Part 3 Give the resulting chemical formula for the ionic compound. NaCl Net charge of 0 (-1)+(1)=

8. Try Barium and Fluorine • Part 1: • Part 2: • Part 3:

9. Try Barium and Fluorine • Part 1: Ba F F • Part 2: Ba2+ F- F- • Part 3: BaF2 NET Charge of 0 2 + (-1) + (-1) =

10. On your own try: • Cs and N • Ga and Br • Sr and P

11. Answers • Cs and N Cs Cs Cs N Cs3N • Ga and Br Ga Br Br Br GaBr3 • Sr and P Sr Sr Sr P P Sr3P2 Cs+ Cs+ N3- Cs+ Br- Br- Ga3+ Br- Sr2+ P-3 P-3 Sr2+ Sr2+

12. Now try • Fe (II) and Cl • Ti (III) and O

13. Charge • Fe (II) and Cl FeCl2 • Ti (III) and O Ti2O3 Charge