Electron Affinities: Fluorine vs Chlorine & EA Explained

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Discussion Overview

The discussion centers on the electron affinity (EA) of fluorine compared to chlorine, exploring why fluorine's EA is higher than expected based on periodic trends. Participants also touch on the general concept of electron affinity and its relation to electron gain enthalpy.

Discussion Character

  • Debate/contested, Conceptual clarification, Technical explanation

Main Points Raised

  • One participant questions why fluorine has a higher electron affinity than chlorine, suggesting it contradicts periodic trends.
  • Another participant clarifies that they are referring to electron affinity, specifically mentioning 'Electron Gain Enthalpy' as synonymous with EA.
  • A different participant suggests that the trend in electronegativity supports the observation, as fluorine is more electronegative than chlorine.
  • One participant proposes that the stability of the electron configurations of F- and Cl- could explain the differences in their electron affinities, implying that one configuration is more stable than the other.
  • Several participants express uncertainty about the answer, indicating a lack of consensus on the explanation.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the reasons behind the higher electron affinity of fluorine compared to chlorine, with multiple competing views and uncertainties remaining in the discussion.

Contextual Notes

Some assumptions regarding periodic trends and electron configurations are not fully explored, and the discussion lacks resolution on the underlying reasons for the observed electron affinities.

kay
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Why is the EA of Fluorine higher than chlorine when it shouldn't be according to periodic trends?

And in general when it is easy to add an electron to a substance, then is the EA high or low?
 
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I forgot to add that by EA i meant 'Electron Affinity.' I think that's all. :(
 
Are you referring to electronegativity? The trend is higher as you go up and right on the periodic table, so F being more electronegative than Cl does not defy the trend.

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I mean Electron Gain Enthalpy or Electron Affinity.
 
So is there no one who knows the answer? :eek:
 
I think it can be explained by use of electron configuration of both F- and Cl-; one is more stable than the other. Therefore the energy to remove an electron from it is essentially larger than that of the other.
 

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