Download VSEPR Theory

VSEPR THEORY
Geometry of Molecules
WHY DO WE CARE???
What is VSEPR theory?
 Valence shell electron-pair repulsion theory—states that repulsion between the sets of valencelevel electrons surrounding an atom causes these sets to oriented as far apart as possible.
Shape of molecules determines:
Polarity
 Solubility
 Reactivity
EXAMPLES
Draw Lewis structures for the following molecules:
H2O
BF3
CH4
NH3
PCl5
SF6
There are many other sub-shapes that
are formed due to lone pairs.
http://chyscience.blogspot.com/2012/12/valence-shell-electron-pair-repulsion.html
PRACTICE
Identify the geometries of the following molecules:
AsF5
SeF6
CF4
NO3-
HYBRIDIZATION
Draw orbital notation for Carbon.
Why doesn’t carbon bond with two things if it has two free valence electrons?
Why is carbon different from boron, which bonds with three things?
Answer: Hybridization.
LOOK MORE AT THE ORBITAL NOTATION FOR CARBON
Lower potential energy = more stable