Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Why is electron affinity positive?

  1. Sep 2, 2015 #1

    Titan97

    User Avatar
    Gold Member

    I was reading thermodynamics and about Born Haber cycle. There, I found that the values given for electron affinity are positive.
    When an electron is added to flourine, it attains noble gas configuration. So i t becomes more stable. So shouldn't the reaction be exothermic?
     
  2. jcsd
  3. Sep 2, 2015 #2

    Bystander

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member
    2016 Award

  4. Sep 2, 2015 #3

    Titan97

    User Avatar
    Gold Member

    So while calculating lattice energy, the negative of the given value has to be taken?
     
  5. Sep 4, 2015 #4

    DrDu

    User Avatar
    Science Advisor

    Electron affinity is especially murky. It makes no sense to talk about it without the sign convention clearly stated. Btw., it's fluorine not flourine.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Why is electron affinity positive?
  1. Electron Affinity (Replies: 2)

  2. Electron affinity (Replies: 5)

  3. Electron Affinities (Replies: 4)

  4. Electron Affinity (Replies: 1)

  5. Electron affinities (Replies: 7)

Loading...