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Covalent radius
How does the concept of covalent radius make sense for helium, as it doesn't normally bond with anything? If it is based on a measurement of a bond in some actual helium compound, what is the compound? It seems like a reference is needed in the infobox.CountMacula (talk) 15:59, 8 November 2022 (UTC)[reply]
Hmm. In Covalent radius it says: Tabulated values of covalent radii are either average or idealized values, which nevertheless show a certain transferability between different situations, which makes them useful. I suspect the idealized values part allows it. Note that on Covalent radius it has two (very) different values for helium. I suspect that not putting one on this page would be a good choice. Gah4 (talk) 18:30, 8 November 2022 (UTC)[reply]
There are known bound ions containing helium, see Helium compounds#Known ions. I don't think it's too much of a stretch to consider HeH+ to contain a H–He covalent bond, so these values make sense even without idealisation. The bigger problem to my mind is that the two values are very different, as Gah4 says. Double sharp (talk) 17:00, 29 December 2023 (UTC)[reply]
Semi-protected edit request on 6 September 2023
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This very early FA needs improvement to keep its status; it has had two cleanup banners for years now. The latter is especially troubling, with sentences such as "is expected to be largely depleted by 2021" and a lack of updates for issues such as conservation, the potential new molecular compounds, and applications usage. I will list this on WP:FARGIVEN, in case anyone wants to take it to FAR. ~~ AirshipJungleman29 (talk) 13:34, 25 March 2024 (UTC)[reply]
level-4 vital article is rated FA-class on Wikipedia's content assessment scale.
Not done: please provide reliable sources that support the change you want to be made. M.Bitton (talk) 21:44, 6 September 2023 (UTC)