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My main reasoning is because 126 being a magic neutron number makes isotopes with 128 neutrons extremely unstable (e.g. 212Po), shouldn't 126 also being a proton magic number make element 128 extremely radioactive? 24.115.255.37 (talk) 02:18, 5 May 2024 (UTC)[reply]
We don't know that 126 is a magic proton number in the first place. It's quite possible, based on current models, that proton shell closures only give a weak effect here and that it's the neutron shell closure at 184 that really matters for SHE stability. OTOH, I agree with the general idea: we are probably going to have a hard time once N = 184 is passed. Double sharp (talk) 08:44, 6 May 2024 (UTC)[reply]
The same effect is also observed in the vicinity of 208Pb, where there are some reasonably long-lived polonium isotopes but alpha half-lives fall by many orders of magnitude at neutron number 128. And indeed, the stabilizing effect for a proton shell at 126, if it even is a magic number, is not agreed upon in different models. It'll be a long time anyway before we can synthesize these elements. –a sock of ComplexRational (talk) 15:47, 6 May 2024 (UTC)[reply]
Hi, read an interesting article postulating a mechanism where the actual inner electrons themselves might add stability by radiating enough energy via the Cherenkov mechanism for unstable nuclei to in fact be meta-stable. This would be a mechanism where theoretically impossible (eg element 164) believed to be found in deep space could have very novel chemistry.
As of yet it is pretty strange stuff but gold and copper are a test case here as their colour is due to relativistic effects.
In actual fact because electrons can be paired they can in fact appear to go faster than light but only a very small fraction of them (0.000001%) and this may in fact be evidence of physics beyond the Standard Model. 91.190.161.160 (talk) 17:16, 29 May 2024 (UTC)[reply]
Ah, now that I wouldn't be so sure of. With all the intruder levels dropping down like 9s and 9p1/2 into period 8, the 8th and 9th periods could very well have different lengths. Assuming it makes sense to talk about elements that far up in the first place, which we also don't know. Better to wait for more computations. :) Double sharp (talk) 12:29, 30 August 2024 (UTC)[reply]
I mean, the lanthanides and actinides have the same length, and I predict Unbiunides and Unseptpentides will also have the same length.
But I get what you're saying, we should wait for more computations for a more accurate extended periodic table. HAt12:33, 30 August 2024 (UTC)[reply]
Yeah, what I mean is that we don't know precisely what orbitals will drop down. It's not out of the question that 6h will fill alongside 10s, which would extend row 9. I don't dare to guess. :) Double sharp (talk) 12:42, 30 August 2024 (UTC)[reply]
I predict the pattern of the 8th period will not use Fricke and Pyykkö’s models, but rather follow the Aufbau principle, meaning the 6f subshell starts at Z = 139, not 143.
I think the isotope 356Uth, with a proton-to-neutron ratio of 1:1.618 (following the trend), might be somewhat stable, with a predicted half life of around 6 to 10 seconds.
Yes, the name is not technically correct. It's not uncommon because there's nothing actually above 121, but really the relationship between Ac and 121 is only secondary: they both have 3 valence electrons, but the set of valence orbitals is not quite analogous (similar to the Al-Sc relationship). Double sharp (talk) 07:50, 3 December 2024 (UTC)[reply]
I use the Scandium-Yttrium-Lanthanum-Actinium trend, not the Scandium-Yttrium-Lutetium-Lawrencium trend, so Unbiunium might be eka-actinium, and Unbibium...it will be something new. For example, In Period 6 and 7, there are the lanthanides and actinides, which are excluded in Period 5 and before. Period 4 and 5 includes the transition metals, which are excluded in Period 3 and before. Period 2 and 3 includes the boron elements, the crystallogens, the pnictogens, the chalogens, the halogens, and the alkaline earth metals, even though Period 1 does not (Hydrogen is said to have its own group since it is similar to the non-metals, the noble gases, and the alkali metals, which is very confusing).
What I am trying to say here is that every new column or some break in the periodic table like the lanthanides would end up having something new ZokiZokias (talk) 14:54, 11 December 2024 (UTC)[reply]
Sc-Y-La-Ac doesn't really make any sense. It changes the rules between the two neighbouring elements Ac and Th, which both have no f-electrons as single atoms, but both can use f-orbitals when chemically bonded. Logically speaking one should be treating them the same way.
121 is indeed calculated to be something new – the first time the g-orbitals can be used for chemistry. Though it would probably be a bit like La, Ac, Th, and Lr in failing to have the right orbital fill on time in a bare atom (it will probably fill when the atom is chemically bonded). With that said, 5g is probably going to be so deeply buried inside the atom that elements 124+ will probably not differ very much from uranium for a while, in about the same way rare earths mimic yttrium. Double sharp (talk) 15:07, 11 December 2024 (UTC)[reply]
Also, we do not know where each element is or whst their properties are. Ununennium & Unbinilium are expected to be alkali metals and alkaline earth metals respectively, and Unbiunium, Unbibium, Unbiquadium, Unbipentium, Unbihexium, and Unbiseptium are expected superactinides. We may never know, Unbiseptium might be a pink liquid and act like a pnictogen, or Unbibium, which is a room-temperature plasma, and gives off Unbibium Vigintoxide. Or ununennium being added to group 19.
Dunno about "never". Mc was chemically investigated this year, and there are ideas on how even Lv and Ts could be in the future. It will be difficult for sure, but not physically impossible.
Moscovium is predicted to act like a Group 15 element. (Yay!)
Livermorium is predicted to act like a Group 16 element. (Yay!).
Nihonium and Tennessine's properties are debatable:
Nihonium might act like a halogen (Nihonine) and Tennessine acting like a Icosagen/Group 13 Element (Tennessium), but it also might be switched.
As for Flerovium and Oganesson, Flerovium might be a liquid or a gas (Flerogen/Flerovigen), maybe even a noble gas! (Fleron/Flerovon). Then there is Oganesson, which would act like a Crystallogen/Group 14 Element.
Seaborgium might be the most refactory metal, Hassium being the densest, and Meitnerium being both refactory and dense. Roentgenium is under Copper, Silver, and Gold, so it might have a different color (Green Metal?). Fermium-Lawrencium act like regular actinides. Copernicium is predicted to be a solid or liquid or gas, but it might have a low ionizing point!
Ruthenium, Rhodium, Palladium, Osmium, Iridium, Platinum are all in the platinum group, so the new candidates might be Hassium, Meitnerium, and Darmstadium. All of the Platinum Group Metals are part of the noble metals, with Gold, and Silver is often used. Roentgenium would the in the noble metals and coinage metals, not the platinum group metals. Copper and Mercury is sometimes used. Technetium, Rhenium, Arsenic, Antimony, Bismuth, and Polonium is a noble metal, IN A LIMITED SENCE (all from Noble metal and paraphrased). The Candidates for the limited sence noble metals would be Moscovium and Livermorium, which are under Bismuth and Polonium respectively, and Bohrium is under Rhenium, which is a metal in a limited sence.
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