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Article changed over to new Wikipedia:WikiProject Elements format by schnee. Elementbox converted 11:09, 10 July 2005 by Femto (previous revision was that of 13:31, 9 July 2005). 9 July 2005
OK, what is a semi-stable isotope? —The preceding unsigned comment was added by 12.41.204.3 ( talk) 22:32, 5 December 2006 (UTC).
a half-life estimated at about 10^23 years. A tiny bit of alpha decay has been observed in "miraculous" experiments done in exotic semiconductors at temperatures close to absolute zero. 10^23 years is far longer than the life of the known universe, and it used to be thought that bismuth-209 was stable. 47.215.188.197 ( talk) 08:38, 8 February 2017 (UTC)
This article states the appearance but does not have a picture of the element. This is peculiar. — Preceding unsigned comment added by 220.245.49.25 ( talk) 05:15, 24 April 2014 (UTC)
I found a few pictures (they may be fake) of promethium. They all occur on more than one webpage, all stating that they are promethium. Do you think they are reliable: http://www.twnree.com/wp-content/uploads/2012/02/61-Promethium.jpg http://businesslife.ba.com/Media/images/rareh-Business-Life-Promethium-credit-periodictable.com-043410ea-8348-4a28-b7cd-aa244d51c5ee-0-450x521.jpg -- 220.245.49.25 ( talk) 23:19, 22 January 2015 (UTC)
I found these images from Chinese websites. I don't know how reliable they is: http://mmbiz.qpic.cn/mmbiz/07vbMHVhyHe9Xa8NzB5iaibFeicn3IPxOmdLljo4hezeQcViaJfa1o8RM9MO2LgwnWnTRYlAs93Ccmk3o0FFOicmXGQ/0 http://a2.att.hudong.com/44/03/01300001385827133437036291016_s.jpg 220.245.49.25 ( talk) 08:43, 12 June 2015 (UTC)
I found the first image from this website, where all images have the same watermark: http://mp.weixin.qq.com/mp/appmsg/show?__biz=MzA5MTMyODAzOA==&appmsgid=200025081&itemidx=1&sign=18d5b6ffdee5643be61983d6d9170022&3rd=MzA3MDU4NTYzMw==&scene=6#wechat_redirect — LL221W ( talk) 11:15, 13 June 2015 (UTC)
I found a image is about promethium sample, but I'm not sure that it's real. The image was made by T. W. Gray, too. But when I uploaded this image to Chinese Wikipedia...yes it will be deleted. It's on the Files for discussion now, see zh:Wikipedia:檔案存廢討論/記錄/2022/02/10#File:Promethium_sample.jpg for more information. Oh guys, I've forgotten to tell you the source of this image is https://periodictable.com/Items/061.2/index.html . -- ERS ROHU ( talk) 12:00, 10 February 2022 (UTC)
When did its name change from prometheum to promethium, and why? I'm sure I remember as a kid (late 1970s) the -eum spelling ... - David Gerard ( talk) 20:24, 3 January 2016 (UTC)
the first paragraph of Applications says that Pm147 can not emit gamma radiation, and the first paragraph of Precautions says that it can. i'm not sure which is correct, hopefully someone else can revise. WordsAndNumbers ( talk) 05:30, 15 October 2021 (UTC)
![]() | This ![]() It is of interest to the following WikiProjects: | ||||||||||
|
![]() | Promethium 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. | |||||||||
|
|
|
This page has archives. Sections older than 730 days may be automatically archived by Lowercase sigmabot III when more than 4 sections are present. |
Article changed over to new Wikipedia:WikiProject Elements format by schnee. Elementbox converted 11:09, 10 July 2005 by Femto (previous revision was that of 13:31, 9 July 2005). 9 July 2005
OK, what is a semi-stable isotope? —The preceding unsigned comment was added by 12.41.204.3 ( talk) 22:32, 5 December 2006 (UTC).
a half-life estimated at about 10^23 years. A tiny bit of alpha decay has been observed in "miraculous" experiments done in exotic semiconductors at temperatures close to absolute zero. 10^23 years is far longer than the life of the known universe, and it used to be thought that bismuth-209 was stable. 47.215.188.197 ( talk) 08:38, 8 February 2017 (UTC)
This article states the appearance but does not have a picture of the element. This is peculiar. — Preceding unsigned comment added by 220.245.49.25 ( talk) 05:15, 24 April 2014 (UTC)
I found a few pictures (they may be fake) of promethium. They all occur on more than one webpage, all stating that they are promethium. Do you think they are reliable: http://www.twnree.com/wp-content/uploads/2012/02/61-Promethium.jpg http://businesslife.ba.com/Media/images/rareh-Business-Life-Promethium-credit-periodictable.com-043410ea-8348-4a28-b7cd-aa244d51c5ee-0-450x521.jpg -- 220.245.49.25 ( talk) 23:19, 22 January 2015 (UTC)
I found these images from Chinese websites. I don't know how reliable they is: http://mmbiz.qpic.cn/mmbiz/07vbMHVhyHe9Xa8NzB5iaibFeicn3IPxOmdLljo4hezeQcViaJfa1o8RM9MO2LgwnWnTRYlAs93Ccmk3o0FFOicmXGQ/0 http://a2.att.hudong.com/44/03/01300001385827133437036291016_s.jpg 220.245.49.25 ( talk) 08:43, 12 June 2015 (UTC)
I found the first image from this website, where all images have the same watermark: http://mp.weixin.qq.com/mp/appmsg/show?__biz=MzA5MTMyODAzOA==&appmsgid=200025081&itemidx=1&sign=18d5b6ffdee5643be61983d6d9170022&3rd=MzA3MDU4NTYzMw==&scene=6#wechat_redirect — LL221W ( talk) 11:15, 13 June 2015 (UTC)
I found a image is about promethium sample, but I'm not sure that it's real. The image was made by T. W. Gray, too. But when I uploaded this image to Chinese Wikipedia...yes it will be deleted. It's on the Files for discussion now, see zh:Wikipedia:檔案存廢討論/記錄/2022/02/10#File:Promethium_sample.jpg for more information. Oh guys, I've forgotten to tell you the source of this image is https://periodictable.com/Items/061.2/index.html . -- ERS ROHU ( talk) 12:00, 10 February 2022 (UTC)
When did its name change from prometheum to promethium, and why? I'm sure I remember as a kid (late 1970s) the -eum spelling ... - David Gerard ( talk) 20:24, 3 January 2016 (UTC)
the first paragraph of Applications says that Pm147 can not emit gamma radiation, and the first paragraph of Precautions says that it can. i'm not sure which is correct, hopefully someone else can revise. WordsAndNumbers ( talk) 05:30, 15 October 2021 (UTC)