Why is electron affinity positive?

  • #1
Titan97
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Main Question or Discussion Point

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?
 

Answers and Replies

  • #3
Titan97
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So while calculating lattice energy, the negative of the given value has to be taken?
 
  • #4
DrDu
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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.
 
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