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Chapter 10
Valence Bond Theory
16
History
10th Grade
12/18/2011

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Cards

Term
The electron density of a sigma bond is greatest along the ____ of the bond
Definition
axis
Term
The main points of the valence bond approach to bonding are: (3)
Definition
1. orbitals overlap to form bonds
2. Two electrons of opposite spin can be accommodated in the overlapping orbitals
-usually one is donated by each atom
3. because off orb ital overlap by the bonding electrons have a higher probability of existing in a region of space influence by both atomic nuclei. Both electrons are attracted by both nuclei
Term
Any element with _________ will undergo hybridization
Definition
valence electrons occupying more than one sub-level forming covalent bonds
Term
The total number of hybrid orbitals is always equal to ____
Definition
the sum of the orbitals mixed to create the hybrid set
Term
Hybrid orbitals are more directed from the central/terminal atom...why?
Definition
better overlap; stronger bond
Term
if the hybridization is sp, what is the angle measurement/epg? How many hybrid orbitals are created?
Definition
180
linar
2
Term
if the hybridization is sp2, what is the angle measurement/epg? How many hybrid orbitals are created?
Definition
120
trigonal-planar
3
Term
if the hybridization is sp3, what is the # of orbitals created/angle measurement/epg?
Definition
four
109.5
tetrahedral
Term
if the hybridization is sp3d, what is the # of orbitals created/angle measurement/epg?
Definition
five
120/90
trigonal bipyramidal
Term
if the hybridization is sp3d2, what is the # of orbitals created/angle measurement/epg?
Definition
6
90
octahedron
Term
_____ bonds lie along the longitudinal axes between 2 nuclei which are bonded
Definition
sigma
Term
____ bonds are formed from orbital overlap between 2 atoms
Definition
sigma
Term
Concerning sigma bonds, both electrons are attracted to both nuclei due to ____
Definition
orbital overlap
Term
___ bonds are always involved in multiple bonds
Definition
pi
Term
____ bonds are always formed by the sideways overlap of p orbitals
Definition
pi
Term
the area of overlap on pi bonds is ___
Definition
either above or below or on each side of the longitudinal axes between the two nuclei
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