1. Tuesday December 8, 2015 TO DO RIGHT NOW: 1.P110-copy words of the day (11total) 2.P120- title- “Lewis Dot/Structural formulas for covalent compounds” HOMEWORK Due tomorrow- Ionic Bonding Diagrams Due Thurs-finish covalent bonding assignment REMINDERS Test is FRIDAY Check your grades. Tutorials today until 3:15 only

3. Review of Bond Types

4. Covalent Bonds A covalent bond results from the sharing of electron pairs between two nonmetals

6. Rules for Writing Lewis Dot Structures 1) A/2 = # electron pairs 2) Central atom is usually C or the single guy 3)Bond atoms together first. 4) Add e- pairs to outside atoms (except hydrogen) 5) Check central atom!

7. Lewis & Structural Formula Ex 1: H 2

8. Ex 2: H 2 O

9. Double Covalent Bonds Bonds that involve 2 shared pairs of electrons O + O  O O

10. Triple Covalent Bond Bond that involves 3 shared pairs of electrons N + N  N N

12. A/2=pairs

13. D. Polyatomic Ions Charged group of covalently bonded atoms The charge is over the whole group of atoms – not an individual atom

14. Polyatomic Ion Ammonium (NH 4 + ) x x x x NH H H H +1

15. Ex: PO 3 -3