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Homework Help: Electric dipole moment in gaseous species.

  1. Nov 13, 2012 #1
    1. The problem statement, all variables and given/known data

    Consider the following species in the gaseous state: [itex] NF_3, \ BeF_2, \ BCl_3, \ KrF_4 \ and \ SeO^{2-}_4 [/itex].
    Which of them have electric dipole moment?

    2. Relevant equations

    3. The attempt at a solution

    I tried google, but I can't figure out how to check that..
  2. jcsd
  3. Nov 13, 2012 #2


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    Can you draw their representative structures, like you draw tetrahedral structure for methane? That can give you the clue.
  4. Nov 13, 2012 #3
    How is drawing the representative structures supposed to give me a clue on which species have electric dipole moment? Is it like, in the case with [itex] BeF_2 [/itex], where [itex] Be [/itex] is left with a positive charge of 2+ and each [itex] F [/itex] with a negative charge of 1-. So it will have electric dipole moment?
  5. Nov 13, 2012 #4


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    Example to what I said:

    BeF2 in gaseous form is a linear molecule, like F---Be---F, so the dipoles are F---Be and Be---F. Now can you determine the net dipole moment?

    What I asked you is to draw the structures of molecules using VBT and VSEPR theory. Like in the case of NF3
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