Covalent Bonding

Drill What is the formula when Be bonds with P?

Agenda Drill Covalent Bonding Notes Covalent Bonding Practice Exit Slip HW

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

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

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

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

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

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

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

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

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

Practice 1 Carbon Dioxide – CO2

Practice 2 Ammonia – NH3

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

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