I've read that the first electron affinity is always negative, meaning that energy is always released upon the addition of this first electron. However, I don't think this will apply to noble gases. Will adding an electron to a noble gas release energy?

Could someone please clarify electron affinity?

Edit: Even though there are no stable negative ions of noble gases. I assume it is still possible to add an electron. Yet it would require energy. Is this true, meaning the affinity is positive?

  • 1
    $\begingroup$ See en.wikipedia.org/wiki/Electron_affinity_%28data_page%29 // Note that for historical reasons, Ea is positive when energy is released, the opposite compared to enthalpy change. $\endgroup$
    – Poutnik
    Feb 19, 2023 at 7:05
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    $\begingroup$ There are no stable negative ions of noble gases. Helium is metastable for long enough to use in accelerators, but that is it. $\endgroup$
    – Jon Custer
    Feb 19, 2023 at 13:23


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