1. Covalent Bonding

2. Drill
What is the formula when Be bonds with P?

3. Agenda Drill Covalent Bonding Notes Covalent Bonding Practice
Exit Slip HW

4. Covalent Bonds Overview
2 Nonmetals
Atoms are bonding by a pair of electrons shared between them
So… 1 bond has 2 electrons

5. Lone Pair
pair of valence electrons that are not shared with another atom

6. 2 Methods
Conceptual Method
N.A.S.L. Method

7. Conceptual Method 4A 5A 6A 7A Hydrogen Common Elements C, Si N, P, As
O, S
F, Cl, Br, I H
# Bonds
# Lone pairs
Options

8. N.A.S.L Method- Step 1
1. Place the least electronegative atom in the center (never hydrogen)

9. N.A.S.L. Method- Step 2 Needed
Sum of the electrons needed for each atom to achieve its octet
N = 8 for representative elements with the exception of:
H- 2
Be- 4
B- 6

10. N.A.S.L. Method- Step 3 Available
Add the number of valence electrons from each atom

11. N.A.S.L. Method- Step 4 Shared
Needed – Available
To determine the number of bonds, divide the number of shared electrons by 2

12. N.A.S.L. Method- Step 5 Lone Pair Electrons
Available – Shared
Divide this number by 2 to get the number of lone pairs and distribute between appropriate terminal atoms to fulfill each atom’s octet

13. Practice 1
Carbon Dioxide – CO2

14. Practice 2
Ammonia – NH3

15. Looking Forward – A Day Monday Tuesday Wednesday Thursday Friday 30
Polarity 2
Ionic/Covalent Quiz
Intermolecular Forces Lab 6
VSEPR Lab
Covalent Wrap-Up 8
Review 12
Unit 3 Test

16. Looking Forward – B Day Monday Tuesday Wednesday Thursday Friday 1
Polarity 5
Ionic/Covalent Quiz
Intermolecular Forces Lab 7
VSEPR Lab
Covalent Wrap-Up 9
Review 13
Unit 3 Test