# Talk:Neptunium

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)

"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)

 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)

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)

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)

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)

Because: "Changed infobox image because the previous image was a nickel-clad sphere, we weren't seeing actual neptunium metal". –LaundryPizza03 (dc̄) 00:44, 4 August 2024 (UTC)
It's not liquefied neptunium, it's solid. Source: [3] HertzDonuts (talk) 05:57, 4 August 2024 (UTC)
@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)
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)
@Nucleus hydro elemon: There is a real Np pic here. Double sharp (talk) 16:12, 20 August 2024 (UTC)
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)
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)
I've uploaded that picture of neptunium. Nucleus hydro elemon (talk) 10:43, 3 September 2024 (UTC)
Thank you! Double sharp (talk) 10:44, 3 September 2024 (UTC)
This website claims that it's a photo of caesium. Mrfoogles (talk) 17:41, 20 August 2024 (UTC)
It can't possibly be that: caesium is golden. Double sharp (talk) 03:32, 21 August 2024 (UTC)
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)
I've removed the picture, due to concerns (see above) over whether it's real or not. Double sharp (talk) 15:37, 2 September 2024 (UTC)

There is a picture of a neptunium fragment in a Japanese lab.  Why does the image keep frequently changing? 2603:8080:D03:89D4:4CEA:FD5B:6E65:90A (talk) 02:18, 10 September 2024 (UTC)
Because we found out that the first picture didn't show visible Np (because it was nickel-plated), and then we found out that the second picture didn't show visible Np either (because it's a computer-generated imitation). So this seems to be the best we can do. Double sharp (talk) 02:22, 10 September 2024 (UTC)