CH301 Worksheet 6: What can you find out about structure and bonding by creating 3 dimensional structures of molecules?
Explanation of columns:
A Compound name or structure
B Creating a 2D Lewis Structure: Create symmetrical layout of atoms and assign EN values to each atom
C Creating a 2D Lewis Structure: Calculate ΔEN> 1.5, bond is ionic. If ΔEN< 1.5, bond is covalent.
D Creating a 2D Lewis Structure: How many valence electrons?
E Creating a 2D Lewis Structure: Does structure follow octet rule or is it hypovalent , hypervalent or radical?
F Creating a 2D Lewis Structure: Do you need to add electron pairs to the center atom to make resonance, double or triple bonds?
G Creating a 2D Lewis Structure: Draw Lewis dot structure
H Creating a 3D Lewis Structure: Count number of regions of electron density around central atom
I-K Creating a 3D Lewis Structure: Determine electronic geometry, hybridization bond angle from regions of electron density
L-N Creating a 3D Lewis Structure: Distinguish bonding and nonbonding electron pairs around central atom to determine molecular geometry
O-P Creating a 3D Lewis Structure: Draw VSEPR 3-D structure first with all valence electrons and then displaying the dipoles from ΔEN
Q,R Creating a 3D Lewis Structure: Firs count number of σ and pi bonds in molecule, then use ΣΔEN=0 or ΣΔEN ≠ 0 to determine molecular polarity
A B C D E F G H I J K L M N O P Q R
Molecular
formula
Initial layout
EN values
Ionic or Covalent
# valence e-
Hypo, hyper or
octet?
Multiple bonds
or resonance
2-D Lewis dot
Structure
#e- rich regions
Elec. geometry
Hybridization
Bond angle
Bondin
g
p
airs
Unbonded pairs
Molecular geom..
3-D VSEPR
structure
VSEPR
with
dipoles
How many sigma
and pi bonds?
Polar or non polar
H2O
NH3
I3-
SO2
