chemical bonding why do atoms stick together, anyway? who cares?

Chemical Bonding

Why do atoms stick together, anyway?

Who cares?

Types of Bonding

• Ionic• Covalent• Metallic

Ionic Bonding:

Covalent Bonding:

Covalent Bonding Uses Valence Electrons

Also called Lewis Dot Symbols

How many valence electrons does a Si atom have?

1 2 3 4 5 6 7 8

12% 12% 12% 12%12%12%12%12%1. 12. 23. 34. 45. 56. 67. 78. 8

Lewis Electron-Dot Structures:Describing Bonding in p-block

compounds

Interpreting Lewis Structures

Drawing your own Lewis Structures

How many total bonding electrons does an acetate ion have?

1 2 3 4 5 6 7 8

12% 12% 12% 12%12%12%12%12%1. 3.51. 72. 83. 104. 125. 136. 147. 15

Why bother?

LewisStructure

MolecularStructure

Resonance Number of Bonds

Reactivity

Spectroscopy

Polarity

Physical Stateand

PropertiesHydrophilicityand phobicity

Back to Drawing Lewis Structures

I have an idea.

Do what I say.

Back to Drawing Lewis Structures

Examples

Examples with multiple bonds

N2

Examples: Exceptions to the Octet Rule

ClF5

CH3CH3

Examples: Reading Organic Structures

CH3CN

CHCCHCH2

Draw the Lewis structure for SO3. How many lone pairs does it have?

1 2 3 4 5

20% 20% 20%20%20%1. 12. 23. 34. 45. 0

Draw the Lewis structure for NO2-.

How many lone pairs does it have?

1 2 3 4 5

20% 20% 20%20%20%1. 12. 23. 34. 45. 0