Find Electron Affinities Higher than 1 for I, C & H

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Discussion Overview

The discussion revolves around the electron affinities of iodine, carbon, and hydrogen, specifically seeking values higher than one for these elements. Participants explore the feasibility of such electron affinities in the context of atomic stability and gas phase behavior.

Discussion Character

  • Debate/contested, Conceptual clarification

Main Points Raised

  • One participant questions the existence of electron affinities greater than one for iodine, carbon, and hydrogen, suggesting that such cases are extremely rare in the gas phase.
  • Another participant reiterates that these electron affinities do not exist, citing the stability issues associated with binding two additional electrons.
  • A participant references a textbook claim that oxygen can achieve a high electron affinity of +844 kilojoules per mol, but questions the stability of the resulting dianion.
  • Further, a participant suggests looking into an article that discusses the few existing dianions, implying that there may be exceptional cases worth exploring.

Areas of Agreement / Disagreement

Participants generally disagree on the existence of electron affinities higher than one for the specified elements, with some asserting that such cases do not exist while others reference specific examples that challenge this view.

Contextual Notes

The discussion highlights the complexity of electron affinities and the conditions under which they may be observed, including the stability of resulting species in the gas phase.

Gab
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Hello there

I am trying to find the electron affinities higher than one for the iodine, carbon and hydrogen atoms?
X n- where X is I , C and H and n>1
Is there any ideas?

Thank you in advance
 
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They don't exist! There is hardly any atom which manages to bind two additional electrons in the gas phase, not even oxygen.
 
DrDu said:
They don't exist! There is hardly any atom which manages to bind two additional electrons in the gas phase, not even oxygen.

my book says oxygen can, and states it to be +844 kilojoules per mol
 
xplosiv3s said:
my book says oxygen can, and states it to be +844 kilojoules per mol
This only means that formation of O2- is a highly endothermic process and that it is not stable.
 
OP, you might want to have a look at this article to get some more information on the (few) existing dianions:

http://dx.doi.org/10.1021/jp107177d

the article is actually quite mind-bending in its own right.
 

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