Timeline for Why is Promethium the only radioactive Lanthanide?
Current License: CC BY-SA 3.0
14 events
| when toggle format | what | by | license | comment | |
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| Dec 19, 2023 at 13:41 | answer | added | Oscar Lanzi | timeline score: 1 | |
| Nov 13, 2023 at 8:57 | history | protected | Nilay Ghosh | ||
| Apr 1, 2020 at 10:22 | answer | added | Poutnik | timeline score: 11 | |
| Apr 1, 2020 at 8:07 | comment | added | Ian Bush | @IvanNeretin while I agree this one would be better in the physics forum there are number of things in chemistry that depend on nuclear properties. Can we no longer discuss NMR here? A few others that come to mind with a few seconds thought are the kinetic isotope effect, Mossbauer spectroscopy, isotope shifts in vibrational spectroscopy and neutron activation analysis | |
| Apr 1, 2020 at 6:06 | comment | added | Ivan Neretin | @theorist See, in natural sciences there is always an exception, or a subtlety, or a tiny deviation in nearly any rule and law. If we start with exceptions, the students never get to know the rules in the first place. Here I stand, and I can do no other. | |
| Apr 1, 2020 at 5:58 | comment | added | theorist | @IvanNeretin I would advise against making such a sweeping absolutist statement. It is well-established that nuclear properties can affect chemical properties. Granted, it's not typical, but it's nevertheless incorrect to take the hard-line stance that it doesn't happen at all. See, for instance: tandfonline.com/doi/abs/10.1080/00222348808212315?src=recsys | |
| Dec 15, 2016 at 22:37 | history | bumped | CommunityBot | This question has answers that may be good or bad; the system has marked it active so that they can be reviewed. | |
| S Nov 15, 2016 at 22:23 | history | suggested | Melanie Shebel | CC BY-SA 3.0 |
title more clear
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| Nov 15, 2016 at 22:04 | review | Suggested edits | |||
| S Nov 15, 2016 at 22:23 | |||||
| Nov 15, 2016 at 16:48 | history | bumped | CommunityBot | This question has answers that may be good or bad; the system has marked it active so that they can be reviewed. | |
| Sep 7, 2016 at 5:51 | comment | added | Gimelist | It is not the only radioactive lanthanide. It is the only one with no stable isotopes. Other stable lanthanides also have naturally occurring radioactive isotopes (samarium is a good example). | |
| Sep 6, 2016 at 17:20 | comment | added | Jon Custer | Glen Seaborg might disagree a little bit on it being chemistry or not ;), but @IvanNeretin is generally correct. The issue isn't f-electrons so much as nuclear structure, where it turns out that the Samarium nucleus is more tightly bound (see nuclear shell model), so flipping one of Promethium's neutrons to a proton results in a lower-energy nucleus (not that it stops there in general, but...). | |
| Sep 6, 2016 at 17:13 | comment | added | Ivan Neretin | Nuclear properties have absolutely nothing to do with chemistry (f-block and everything). Promethium being radioactive is just bad luck. Technetium is another such case. | |
| Sep 6, 2016 at 17:01 | history | asked | paracetamol | CC BY-SA 3.0 |