Talk:Neptunium

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Neptunium has been listed as one of the Natural sciences good articles under the good article criteria. If you can improve it further, please do so. If it no longer meets these criteria, you can reassess it.

Article milestones
Date	Process	Result
July 7, 2014	Good article nominee	Listed
September 29, 2014	Good topic candidate	Promoted
February 15, 2024	Good topic removal candidate	Demoted
A fact from this article appeared on Wikipedia's Main Page in the "Did you know?" column on August 6, 2014. The text of the entry was: Did you know ... that neptunium* is found in at least three allotropes‍—‌one orthorhombic, one tetragonal, and one body-centered cubic?*
Current status: Good article

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Update on space group

A couple years ago, I tagged issues with the space group. There were no less than four separate symbols in scholarly sources (P42, P42₁, P42₁2, and P4/nmm). The source for symbol P42 cites a source that instead gives symbol P42₁2, so P42 is clearly a typo. I recently figured out that P42₁ is an archaic symbol from the 1935 edition of the international tables [1] (it was subsequently replaced with symbol P42₁2). Basically, notation aside, all sources agree on P42₁2, except Mehl 2016 who claims he re-analyzed the original data, and found a slightly higher symmetry of P4/nmm (P4/nmm is a minimal supergroup of P42₁2 [2], so this is a relatively minor difference). 〈 Forbes₇₂ | Talk 〉 02:28, 30 November 2023 (UTC)[reply]

Semi-protected edit request on 7 April 2024

Moved from Template talk:Infobox neptunium

This edit request to Template:Infobox neptunium has been answered. Set the |answered= or |ans= parameter to no to reactivate your request.

"many false claims" is stated in the article, please specify what false claims or remove the line. The element was first discoverd by a romanian and it was not proved as a false or true claim. 84.232.193.86 (talk) 19:14, 7 April 2024 (UTC)[reply]

Not done: please provide reliable sources that support the change you want to be made. '''[[User:CanonNi]]''' (talk|contribs) 23:50, 7 April 2024 (UTC)[reply]

Naming

I think the description on how it was named in the introduction paragraph is kind of clumsy. Anyone else agree? Jokem (talk) 03:40, 9 April 2024 (UTC)[reply]

I replaced it with a more concise text. Not sure whether we should keep the mention of uranium even if it is quite redundant with transuranic. Feel free to improve. Jähmefyysikko (talk) 09:23, 9 April 2024 (UTC)[reply]

Image

There used to be an image of a neptunium sphere. Now it’s got replaced by liquified neptunium. Why is this? Legoplanecrash5383 (talk) 22:21, 3 August 2024 (UTC)[reply]

Because: "Changed infobox image because the previous image was a nickel-clad sphere, we weren't seeing actual neptunium metal". –LaundryPizza03 (d c̄) 00:44, 4 August 2024 (UTC)[reply]

It's not liquefied neptunium, it's solid. Source: [3] HertzDonuts (talk) 05:57, 4 August 2024 (UTC)[reply]

@HertzDonuts: Though, this site claims that the Np image is not real. (Though it includes a real one, with a long-since dead source.) Double sharp (talk) 15:05, 20 August 2024 (UTC)[reply]

If that Np is fake, it should be deleted, just like other fake element pictures. But after that we have no more pictures of Np left except the original nickel-clad sphere. Nucleus hydro elemon (talk) 15:29, 20 August 2024 (UTC)[reply]

@Nucleus hydro elemon: There is a real Np pic here. Double sharp (talk) 16:12, 20 August 2024 (UTC)[reply]

That image appears to have been created during the research for paper which has been published under a CC license, but the image wasn't part of the paper and is copyright a japanese nuclear institute, so we can't use it. Mrfoogles (talk) 17:53, 20 August 2024 (UTC)[reply]

We could under fair use if it's really true that there's no free equivalent. We already do that for curium, after all. Double sharp (talk) 03:25, 21 August 2024 (UTC)[reply]

This website claims that it's a photo of caesium. Mrfoogles (talk) 17:41, 20 August 2024 (UTC)[reply]

It can't possibly be that: caesium is golden. Double sharp (talk) 03:32, 21 August 2024 (UTC)[reply]

Also, the Np image is by LLNL, which is a US Government contracter, and its employees are not employees of the federal government, so I think that the license is incorrect. I'm pretty sure that LLNL publishes its images under a CC-BY-NC license. Mrfoogles (talk) 17:47, 20 August 2024 (UTC)[reply]