I. BondingA. What is a chemical bond? Why study chemical bonds?B. Types of Chemical Bonds

1. Elements of Largely Different IEa. Ionic Bonds (electrons transferred)

2. Elements of Similar IEb. Covalent Bonds (electrons shared)

Chemical Bonding

Bonding in H2

+1e-

1e-

Bonding in NaCl

+

10 e- 17 e-

18 e-

9 e-

+

-

ioni

c

covalent

Ionic Character and Electronegativity

Dipole Moments

Trends in Electronegativity

Recognizing Polar Bonds

H-H

Cl-Cl

H-Cl

H-F

C-O

C-FO-O

Recognizing Ionic vs Covalent Compounds

Ionic Compounds – Form from metals and nonmetals

Covalent Compounds – Form from nonmetals

CO2

N2O4

CaCl2

NaF

MgO

C6H6

HCl

Net Dipole Moment

Ionic Solid

Ionic Solid

Ionic Solid

Ionic Solid