Bond Lengths -Type of Atoms

Two factors determine the lenth of a bond. These are: 1)the type of bond between the two atoms and 2) the types of atoms which make up the bond. The purpose of this exercise is to allow you to look at how the type of atom affects the bond length.

  1. Build and minimize the halogen series of methanes: fluoromethane, chloromethane, bromomethane, and iodomethane. For each, record the energy, , carbon-halogen bond length, and the angle indicated in the diagram below.
  2. Do the lengths increase or decrease from fluorine to iodine? Does this match what you expect to see from your study of the periodic properties?
  3. Which is a better property to use to determine the stability of a compound, the energy or the ?
Compound Energy Bond length Bond angle
fluoromethane



chloromethane



bromomethane



iodomethane



Molecular structures of fluoromethane, chloromethane, bromomethane, and iodomethane




Problem contributed by: Luise E. Strange (DeKalb College)
Web implementation by: Luise E. Strange (DeKalb College)

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