Lecture 4 (Bonding models, VSEPR, etc.) Flashcards
What is valence-shell electron-pair repulsion?
Each valence electron pair of the central atom is stereochemically significant and these repulsions determine the molecular shape.
What does central atom geometry depend on?
the number of electron domains, that are spaced out to minimize inter-electronic repulsions
In trigonal bipyramidal structures, lone pairs and multiple bonded atoms occupy what positions?
equatorial
In pseudo-octahedral structures, lone pairs and multiple bonded atoms are in what position?
trans to each other
VSEPR for 2 bonds no lone pairs?
Linear
VSEPR for 3 bonds and no lone pairs?
Trigonal planar
VSEPR for 4 bonds and no lone pairs?
Tetrahedral
VSEPR for 5 bonds and no lone pairs?
Trigonal Bipyramidal
VSEPR for 6 bonds and no lone pairs?
Octahedral
VSEPR for 2 bonds and 1 lone pair?
Bent
VSEPR for 3 bonds and 1 lone pair?
Trigonal Pyramidal
VSEPR for 4 bonds and 1 lone pair?
Disphenoidal
VSEPR for 5 bonds for 1 lone pair?
Square Pyramidal
VSEPR for 2 bonds and 2 lone pairs?
Bent
VSEPR for 3 bonds for 2 lone pairs?
T-shape
VSEPR for 4 bonds and 2 lone pairs?
Square Planar
VSEPR for 2 bonds and 3 lone pairs?
Linear
VSEPR for 3 bonds and 3 lone pairs?
T-shape
VSEPR for 2 bonds and 4 lone pairs?
Linear
More electronegative atoms cause electron density to be …
closer towards the atom and therefore make electrons repel each other (make a bigger bond angle)
What is the Valence Bond Theory
When the bonding of individual atoms interact, they will retain their original character
How are hybrid orbitals generated?
by mixing the atomic orbitals
How to make a VBT diagram (step-by-step)?
1) Find Lewis Structure
2) Make VSEPR
3) Draw the 2s and 2p orbitals and fill the electrons in, as well as drawing the orbitals of the full electron configuration
