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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