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Homework Help: Polarity of the Binary Halogen Acids

  1. Jun 21, 2014 #1


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    Does the polarity of the binary halogen acids increase or decrease down the group?

    I have one argument for decrease based solely on electronegativity considerations.

    I have one argument for increase based on orbital overlap and electron density. Taking electron density in an orbital to be non-uniform and decreasing as we get further from the nucleus, it follows that as the halogens get bigger, there is less electron density at the fringes - or where the hydrogen would overlap. This, combined with the relatively greater electronegativity of the halogens (expect iodine) relative to hydrogen, gives the bond ionic character.

    Which one is correct?
  2. jcsd
  3. Jul 2, 2014 #2
    I'm sorry you are not generating any responses at the moment. Is there any additional information you can share with us? Any new findings?
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