Periodic Trends
Objective
The objective of this exercise is to observe periodic trends in bond angles as we move around the
period table.
Procedure
Use the specified calculation method to fill in the bond angles of the following molecules:
|
Molecule |
PM3 Bond Angle |
Ab Initio [HF/6-311G+(d,p)] |
Experimental Bond Angle |
H2O |
  |
  |
104.5 |
H2S |
  |
  |
92.3 |
H2Se |
  |
  |
92.3 |
F2O |
  |
  |
103.2 |
Cl2O |
  |
  |
110.8 |
|
In the following section, you will use the WebMO editor to determine the atomic radius of several atoms.
Using the WebMO editor, draw a dimer of each of the following atoms. Enter adjust mode and select both
atoms; the bond distance should be displayed in the status bar. Dividing this bond length by two yields
the atomic radius for that atom.
|
Atom |
O |
S |
Se |
H |
F |
Cl |
Radius |
  |
  |
  |
  |
  |
  |
|
Describe and explain the trends observed in bond angle as a function of
|
Central Atom:
Outer Atom:
|
Key
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