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does anyone else think that a small section mentioning fictional elements with atomic numbers in this range would be permissible or a good idea? I dont even know if there are any significant mentions outside of star trek and comics, but if, say, greg bear mentions one, thats somewhat notable. Mercurywoodrose ( talk) 05:56, 7 March 2011 (UTC)
What does really cause Unsepttrium to be the the last possible atom to exist? Something about the electrons' speed of light thing? —Preceding unsigned comment added by John Flammic ( talk • contribs) 15:38, 26 October 2010 (UTC)
Why do all blocks have their own articles, but not the g-block? -- Piotr Konieczny aka Prokonsul Piotrus| talk 16:19, 11 June 2011 (UTC)
The periodic table will end at . Here's what it would look like:
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Key:
-- 3.14159265358pi ( talk) 00:23, 11 December 2011 (UTC)
All heavier elements than Ust (the heaviest element listed on the table) would not exist. And, the answer to your question is: I copied the table off the article, self-recoloring it. I used the colors df12ac, c83dc0, b1fcdd, cff377, and ff7700, and deleted the key template. I added my own key to show what each color means. It was therefore from the article Extended periodic table and from my own work. -- 3.14159265358pi ( talk) 00:38, 11 December 2011 (UTC) And here's another table like this one but with a complete period 9:
Key:
The color aaaaaa was used to show elements that would be impossible. -- 3.14159265358pi ( talk) 01:27, 11 December 2011 (UTC)
Well, I can prove element 174 would have nucleons faster than light. Untrioctium's electrons would travel faster than light, and thus can only exist as an ion. Untriseptium would have electrons traveling at near the speed of light, and thus can exist as a neutral atom. Unsepttrium would also have electrons faster than light, but nucleons traveling at a velocity near the speed of light, and thus can only exist as an ion. Unseptquadium's nucleons would travel faster than light, and thus would not exist at all. And by the way, "and thus would not exist at all" in that last sentence is what I refer to as "impossible" in that last periodic table key. -- 3.14159265358pi ( talk) 14:16, 11 December 2011 (UTC) And here's a similar Periodic table:
Key:
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The "synthetic element" group is divided into three parts: those that can be formed via neutron capture, colored a4fd9e, those which cannot (b1fcdd), and those in the island of stability (b3fcfa). Undiscovered elements that can exist as a neutral atom are separated into two groups: those in the island of stability, in e4dda8, and those outside the island of stability (cff377). — Preceding unsigned comment added by 3.14159265358pi ( talk • contribs) 15:08, 11 December 2011 (UTC)
The fourth and fifth colors in the key are b1fcdd and b3fcfa. -- 3.14159265358pi ( talk) 15:14, 11 December 2011 (UTC)
Nice try, but the suggested name for element 116 is moscovium (Mc). Any refs? -- 3.14159265358pi Have a discussion here 23:04, 16 December 2011 (UTC)
And the symbol for copernicium is Cn, not Cp. -- 3.14159265358pi Have a discussion here 23:08, 16 December 2011 (UTC)
And finally, D is the symbol for deuterium. -- 3.14159265358pi Have a discussion here 23:13, 16 December 2011 (UTC)
There's no such thing as "Canadium". Copernicium is 'Cn' because 'Cp' is already used for cassiopeium and cyclopentadienyl. — kwami ( talk) 00:46, 18 December 2011 (UTC)
The problem with the Extended periodic Table is the same as with traditional Periodic table: It ignores quantum mechanics and therefore inconsistent. Since s, p, d, f and g-blocks of the periodic system correspond to quantum number l=0,1,2,3 and 4, placing them in order such as in that periodic table 0,4,3,2,1 is mathematically repugnant. Therefore, all layouts where s-block is not followed by p-block are subjective and do not reflect quantum reality. Such periodic table layouts will be inevitably replaced in the future by Janet's LSPT-like layouts, just as geocentric cosmological model, that persisted for about 1900 years, was replaced by heliocentric model. Drova ( talk) 16:01, 16 December 2011 (UTC)
The problem I have with the set of graphical motivations for the now traditional periodic table and most of its approximately 1000 incarnations is that they are a historically cumulated set- reflecting different eras with different understandings of the chemical and physical phenomena whose capture is being attempted. Is hydrogen a halide (H- hydride) or an alkali metal (electronic configuration s1)? Is helium a noble gas (combinatory behavior) or an alkaline earth (electronic s2 configuration)? In depicting the periodic system one has to have some sort of hierarchical plan- which motivations are primary, which secondary, and so on? The quantum mechanics-first ordering gives, ideally, something like the Janet Left-Step table. The traditional table is far too dependent on 'surface' properties that meant so much to 19th century chemistry. These properties are no less real than the quantum mechanical ones, and both deep and surface levels have their own individual inconsistencies (as for example in the Aufbau anomalies of chromium, copper and so on). For me this indicates a complex hierarchical situation, not helped by the fact that quantum mechanics isn't the only structurally significant effect here (others including differential shielding of different values of l, role of relativity, etc.). Given all this, and the numbers of different forces helping to shape the periodic system's member elements and their properties, it is claimed by some that there cannot be any 'best' general depiction- there are simply too many ways to prioritize the graphical representation's structural motifs, in a small number of available dimensions (spatial, symbolic, etc.). I'm actually not sure that this is true, entirely. It may be that the periodic system's motivations change their prioritization in some regular fashion as one builds it up- this might reflect some kind of fractal organization that is currently not clear to investigators. For example Fibonacci numbers, taken AS atomic numbers are both nonrandomly and nonarbitrarily placed within the system/table. Up to 89, the last Fib number within known elements, they map, WITHOUT EXCEPTION, to the leftmost positions within orbital half-rows. In addition, ALL the odd Fib numbers within this set map to the first half-row's leftmost position, and ALL the even Fib numbers map to the second half-row's leftmost position. Look for yourself- don't take it on faith. Related Lucas numbers map to RIGHTMOST positions within orbital half-rows, but less perfectly, with exceptions starting with 29, copper, and 47 silver. Both these 'fix' their table-positional error by having anomalous electronic configurations that do fit the half-row mapping, in terms of half- or completely filled orbitals. 76, osmium, behaves often as if it were xenon, a noble gas with a filled orbital. Some might say that such facts amount to a conspiracy- though not necessarily implying deliberation or design. So there is plenty of room for discovery with regard to finding out what makes the periodic system tick. By no means is it a 'done deal' even in terms of the connectivities of known elements. 67.81.236.32 ( talk) 04:06, 21 December 2011 (UTC)
Reference 5 from the EB is dated "ca. 2006" but is credited to Seaborg. As Seaborg died in 1999, something doesn't seem right. Is there an explanation for this? Double sharp ( talk) 02:57, 4 January 2012 (UTC)
I like to see some layout of the conjectured reasons which may limit the extent of the periodic table even if the nuclear decay-rates aren't prohibitive. This discussion does that. I broke up some long stringy sentences to help. jimswen ( talk) 08:36, 4 December 2013 (UTC)
I want to name these elements which haven't been named.(From 113 to 127, which is the last element of stable island) (Named elements:113(Bq), 114(Fl), 116(Lv) 115--venusium(Vn)(from planet Venus) 117--jupiterine(Jp)(from planet Jupiter) 118--marson(Ms)(from planet Mars) 119--romeodium(Rm)(from Romeo) 120--julietium(Jl)(from Juliet) 121--saturnium(St)(from planet Saturn) 122--athenium(An)(from Athena) 123--aphroditium(Ap)(from Aphrodite) 124--pandorium(Pd, I want to change the sign to element 46 to "Pl")(from Pandora) 125--erinium(En)(from dwarf planet Erin) 126--zeusium(Zs)(from Zeus) 127--newtonium(Nw)(from Newton) — Preceding unsigned comment added by 頗想鈮 ( talk • contribs) 13:47, 19 January 2013 (UTC)
Is the notation of density as a product rather than a quotient standard or just someone being a Clever Dick? 73.213.142.170 ( talk) 22:26, 8 September 2015 (UTC)Americanegro
I suggest that, although the elements past number 173 are theoretically impossible, it's theoretical. Therefore, they should be included despite the impossibility. It could be there simply for clarity. Placejuror ( talk) 13:55, 22 April 2013 (UTC)
I concur. In theory, 174 is impossible, but 119 could be impossible for all we know! E174 may have electron clouds with less spacing, or exist solely as an ion (although at that point a periodic table based solely on chemical properties breaks apart). Via nucleosynthesis, we know that compound nuclei up to Z=200 (Fermium plus Fermium) are possible before neutron channeling and all that physics stuff. While it's unknown what would happen, it is highly likely, if not very probable, that Z=200 would be produced in the subsequent reaction. I'm going to stop now before I get on a bigger rant, but I do reccomend extending the already extended periodic table to at least finish the ninth period, if not into the tenths, eleventh, and continuing on down the line. Stopping a completely theoretical extension because of predicted data that may possibly hinder existence maybe someday decades or more likely centuries in the future just doesn't seem to make much sense. I've already drafted this possible extension on my user page. Jacob S-589 ( talk) 00:42, 24 September 2013 (UTC)
Yes, however, this only goes up to Z=184 before going into "...". I think that our first priority should be to reform the large table to follow relativistic effects, because as far as the page viewing data is concerned, the large table is the one that people go to. However, if we do decide to continue the large periodic table, I think that we should go beyond the 184 that the compact one goes up to, as people may misconstrue this to be the "end" of the periodic table. Jacob S-589 ( talk) 19:13, 24 September 2013 (UTC)
P.S. on eka-superactinides: Fricke says that 6g, 7f, and 8d are being filled by E184, and later 6h, 10s, and 10p1/2 may fill too. If so, one would expect there to be 68 elements in this series, ending at E240. But given the lack of calculations reaching up to that area (and how do you suppose we would synthesize E240 anyway?), we must take this speculation with several moles of salt. Double sharp ( talk) 08:06, 21 September 2015 (UTC)
Can you define a p1/2 subshell?? Georgia guy ( talk) 19:42, 15 October 2015 (UTC)
Elements up to 369 have known atomic weights. In fact, we know the state of matter of lots of heavy elements. For example, we know that 218 is a solid at room temperature! 108.71.122.60 ( talk) 12:36, 30 September 2016 (UTC)
126 to 134 are all stable. 108.65.81.121 ( talk) 23:44, 21 October 2016 (UTC)
The purpose of an article's talk page (accessible via the talk or discussion tab) is to provide space for editors to discuss changes to its associated article or project page. Article talk pages should not be used by editors as platforms for their personal views on a subject.
The alkali metal article says:
Although a simple extrapolation of the periodic table would put element 169, unhexennium, under ununennium, Dirac-Fock calculations predict that the next alkali metal after ununennium may actually be element 165, unhexpentium, which is predicted to have the electron configuration [Uuo] 5g18 6f14 7d10 8s2 8p1/22 9s1.
I would like to know if anyone objects to a statement like the following in an appropriate section of this article:
Although a simple extrapolation of the periodic table would put the elements after 120 as follows: 121-138 form the g-block superactinoids; 139-152 form the f-block superactinoids, 153-162 would be transition metals; 163-166 p-block metals; 167=halogen; 168=noble gas; 169=alkali metal; 170=alkaline earth metal, Dirac-Fock calculations predict that it will most likely go: 121-140 form the g-block superactinoids; 141-154 form the f-block superactinoids; 155-164 form the transition metals; 165=alkali metal; 166=alkaline earth metal; 167-170 p-block metals; 171=halogen; 172=noble gas.
Any thoughts on where a statement like this can go in the article?? Georgia guy ( talk) 15:20, 16 November 2015 (UTC)
What is special about 184 that makes it the highest atomic number to mention in this article?? Is there a proof that it's impossible (not just difficult, but impossible) to find the atomic number of the highest eka-superactinide?? Georgia guy ( talk) 18:45, 8 December 2015 (UTC)
First of all, a criterion to select a group number is not the number of d-electrons but the number of valence electrons including d-shell. We have 7d109s0 for element 164 as well as 4d105s0 for palladium; elements from 157 to 162 has from 3 to 8 valence electrons (over closed 5g186f148s28p2 shell), as well as elements from lutetium to osmium (over closed 4f14 shell).
Secondly, elements 165 and 166 seem to be too far from being alkali and alkali-earth metals. The soft 7d subshell under valence 9s electrons makes these elements similar to silver and cadmium, and maybe both of them (or at least element 165) could still use their 7d electrons for chemical bonding.
Thirdly, elements 155 and 156 have their 6f subshell still opened for chemical bonding, making them similar to mendelevium and nobelium, so they shouldn't count as 7d-elements.
To make all of that clear, let's remember that all of these elements are metals, so their chemical nature is better described by electronic structure of their cations instead of neutral atoms. When atom is positively ionized, a few things happen:
Thus, for metals the periodic trends are far better described by configurations of dications instead of neutral atoms (after element 122 the given configurations may appear a bit higher than the ground state, but at least they are close to the ground state).
That's why I propose a somewhat simpler and less detailed template for extended periodic table, looking like this:
Note that it has little sense trying to separate 5g and 6f blocks since both of them has quite uncertain starting bounds. However, the 18-electron capacity of 5g yields some correlations along two subsets 121-138 and 139-156 since both of them have 18-element length. Elements of the subset 121-138 have up to 6 valence electrons (like 6f28s28p2 with 8s2 gradually drowning into the core) and are very similar just like lanthanides overall, while the subset 139-156 reminds actinides: first elements has an increasing number of valence electrons (6fk7d28p2), but then 6f subshell is buried down along with 8p, leaving only 7d2 electrons easy to remove (as well as 7s2 electrons in nobelium).
After all, that's not an original research: the corresponding model was introduced in 2006 by Nefedov et.al.; here's the paper: http://www.primefan.ru/stuff/chem/nefedov.pdf
So, again, I propose that simple model with elements 157-172 belonging to groups 3-18 as the best guess to their chemical nature, and elements 121-156 separated as two 18-element subsets according to their complicated electronic structure and overall likeness to lanthanides and actinides, respectively. Droog Andrey ( talk) 12:40, 7 March 2016 (UTC)
121: [118]8s, [118]8s2, [118]8s28p
122: [118]8s, [118]8s2, [118]8s27d, [118]8s27d8p Double sharp ( talk) 15:46, 14 July 2016 (UTC)
![]() | This is an archive of past discussions. Do not edit the contents of this page. If you wish to start a new discussion or revive an old one, please do so on the current talk page. |
Archive 1 | Archive 2 | Archive 3 | Archive 4 |
does anyone else think that a small section mentioning fictional elements with atomic numbers in this range would be permissible or a good idea? I dont even know if there are any significant mentions outside of star trek and comics, but if, say, greg bear mentions one, thats somewhat notable. Mercurywoodrose ( talk) 05:56, 7 March 2011 (UTC)
What does really cause Unsepttrium to be the the last possible atom to exist? Something about the electrons' speed of light thing? —Preceding unsigned comment added by John Flammic ( talk • contribs) 15:38, 26 October 2010 (UTC)
Why do all blocks have their own articles, but not the g-block? -- Piotr Konieczny aka Prokonsul Piotrus| talk 16:19, 11 June 2011 (UTC)
The periodic table will end at . Here's what it would look like:
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Key:
-- 3.14159265358pi ( talk) 00:23, 11 December 2011 (UTC)
All heavier elements than Ust (the heaviest element listed on the table) would not exist. And, the answer to your question is: I copied the table off the article, self-recoloring it. I used the colors df12ac, c83dc0, b1fcdd, cff377, and ff7700, and deleted the key template. I added my own key to show what each color means. It was therefore from the article Extended periodic table and from my own work. -- 3.14159265358pi ( talk) 00:38, 11 December 2011 (UTC) And here's another table like this one but with a complete period 9:
Key:
The color aaaaaa was used to show elements that would be impossible. -- 3.14159265358pi ( talk) 01:27, 11 December 2011 (UTC)
Well, I can prove element 174 would have nucleons faster than light. Untrioctium's electrons would travel faster than light, and thus can only exist as an ion. Untriseptium would have electrons traveling at near the speed of light, and thus can exist as a neutral atom. Unsepttrium would also have electrons faster than light, but nucleons traveling at a velocity near the speed of light, and thus can only exist as an ion. Unseptquadium's nucleons would travel faster than light, and thus would not exist at all. And by the way, "and thus would not exist at all" in that last sentence is what I refer to as "impossible" in that last periodic table key. -- 3.14159265358pi ( talk) 14:16, 11 December 2011 (UTC) And here's a similar Periodic table:
Key:
|
The "synthetic element" group is divided into three parts: those that can be formed via neutron capture, colored a4fd9e, those which cannot (b1fcdd), and those in the island of stability (b3fcfa). Undiscovered elements that can exist as a neutral atom are separated into two groups: those in the island of stability, in e4dda8, and those outside the island of stability (cff377). — Preceding unsigned comment added by 3.14159265358pi ( talk • contribs) 15:08, 11 December 2011 (UTC)
The fourth and fifth colors in the key are b1fcdd and b3fcfa. -- 3.14159265358pi ( talk) 15:14, 11 December 2011 (UTC)
Nice try, but the suggested name for element 116 is moscovium (Mc). Any refs? -- 3.14159265358pi Have a discussion here 23:04, 16 December 2011 (UTC)
And the symbol for copernicium is Cn, not Cp. -- 3.14159265358pi Have a discussion here 23:08, 16 December 2011 (UTC)
And finally, D is the symbol for deuterium. -- 3.14159265358pi Have a discussion here 23:13, 16 December 2011 (UTC)
There's no such thing as "Canadium". Copernicium is 'Cn' because 'Cp' is already used for cassiopeium and cyclopentadienyl. — kwami ( talk) 00:46, 18 December 2011 (UTC)
The problem with the Extended periodic Table is the same as with traditional Periodic table: It ignores quantum mechanics and therefore inconsistent. Since s, p, d, f and g-blocks of the periodic system correspond to quantum number l=0,1,2,3 and 4, placing them in order such as in that periodic table 0,4,3,2,1 is mathematically repugnant. Therefore, all layouts where s-block is not followed by p-block are subjective and do not reflect quantum reality. Such periodic table layouts will be inevitably replaced in the future by Janet's LSPT-like layouts, just as geocentric cosmological model, that persisted for about 1900 years, was replaced by heliocentric model. Drova ( talk) 16:01, 16 December 2011 (UTC)
The problem I have with the set of graphical motivations for the now traditional periodic table and most of its approximately 1000 incarnations is that they are a historically cumulated set- reflecting different eras with different understandings of the chemical and physical phenomena whose capture is being attempted. Is hydrogen a halide (H- hydride) or an alkali metal (electronic configuration s1)? Is helium a noble gas (combinatory behavior) or an alkaline earth (electronic s2 configuration)? In depicting the periodic system one has to have some sort of hierarchical plan- which motivations are primary, which secondary, and so on? The quantum mechanics-first ordering gives, ideally, something like the Janet Left-Step table. The traditional table is far too dependent on 'surface' properties that meant so much to 19th century chemistry. These properties are no less real than the quantum mechanical ones, and both deep and surface levels have their own individual inconsistencies (as for example in the Aufbau anomalies of chromium, copper and so on). For me this indicates a complex hierarchical situation, not helped by the fact that quantum mechanics isn't the only structurally significant effect here (others including differential shielding of different values of l, role of relativity, etc.). Given all this, and the numbers of different forces helping to shape the periodic system's member elements and their properties, it is claimed by some that there cannot be any 'best' general depiction- there are simply too many ways to prioritize the graphical representation's structural motifs, in a small number of available dimensions (spatial, symbolic, etc.). I'm actually not sure that this is true, entirely. It may be that the periodic system's motivations change their prioritization in some regular fashion as one builds it up- this might reflect some kind of fractal organization that is currently not clear to investigators. For example Fibonacci numbers, taken AS atomic numbers are both nonrandomly and nonarbitrarily placed within the system/table. Up to 89, the last Fib number within known elements, they map, WITHOUT EXCEPTION, to the leftmost positions within orbital half-rows. In addition, ALL the odd Fib numbers within this set map to the first half-row's leftmost position, and ALL the even Fib numbers map to the second half-row's leftmost position. Look for yourself- don't take it on faith. Related Lucas numbers map to RIGHTMOST positions within orbital half-rows, but less perfectly, with exceptions starting with 29, copper, and 47 silver. Both these 'fix' their table-positional error by having anomalous electronic configurations that do fit the half-row mapping, in terms of half- or completely filled orbitals. 76, osmium, behaves often as if it were xenon, a noble gas with a filled orbital. Some might say that such facts amount to a conspiracy- though not necessarily implying deliberation or design. So there is plenty of room for discovery with regard to finding out what makes the periodic system tick. By no means is it a 'done deal' even in terms of the connectivities of known elements. 67.81.236.32 ( talk) 04:06, 21 December 2011 (UTC)
Reference 5 from the EB is dated "ca. 2006" but is credited to Seaborg. As Seaborg died in 1999, something doesn't seem right. Is there an explanation for this? Double sharp ( talk) 02:57, 4 January 2012 (UTC)
I like to see some layout of the conjectured reasons which may limit the extent of the periodic table even if the nuclear decay-rates aren't prohibitive. This discussion does that. I broke up some long stringy sentences to help. jimswen ( talk) 08:36, 4 December 2013 (UTC)
I want to name these elements which haven't been named.(From 113 to 127, which is the last element of stable island) (Named elements:113(Bq), 114(Fl), 116(Lv) 115--venusium(Vn)(from planet Venus) 117--jupiterine(Jp)(from planet Jupiter) 118--marson(Ms)(from planet Mars) 119--romeodium(Rm)(from Romeo) 120--julietium(Jl)(from Juliet) 121--saturnium(St)(from planet Saturn) 122--athenium(An)(from Athena) 123--aphroditium(Ap)(from Aphrodite) 124--pandorium(Pd, I want to change the sign to element 46 to "Pl")(from Pandora) 125--erinium(En)(from dwarf planet Erin) 126--zeusium(Zs)(from Zeus) 127--newtonium(Nw)(from Newton) — Preceding unsigned comment added by 頗想鈮 ( talk • contribs) 13:47, 19 January 2013 (UTC)
Is the notation of density as a product rather than a quotient standard or just someone being a Clever Dick? 73.213.142.170 ( talk) 22:26, 8 September 2015 (UTC)Americanegro
I suggest that, although the elements past number 173 are theoretically impossible, it's theoretical. Therefore, they should be included despite the impossibility. It could be there simply for clarity. Placejuror ( talk) 13:55, 22 April 2013 (UTC)
I concur. In theory, 174 is impossible, but 119 could be impossible for all we know! E174 may have electron clouds with less spacing, or exist solely as an ion (although at that point a periodic table based solely on chemical properties breaks apart). Via nucleosynthesis, we know that compound nuclei up to Z=200 (Fermium plus Fermium) are possible before neutron channeling and all that physics stuff. While it's unknown what would happen, it is highly likely, if not very probable, that Z=200 would be produced in the subsequent reaction. I'm going to stop now before I get on a bigger rant, but I do reccomend extending the already extended periodic table to at least finish the ninth period, if not into the tenths, eleventh, and continuing on down the line. Stopping a completely theoretical extension because of predicted data that may possibly hinder existence maybe someday decades or more likely centuries in the future just doesn't seem to make much sense. I've already drafted this possible extension on my user page. Jacob S-589 ( talk) 00:42, 24 September 2013 (UTC)
Yes, however, this only goes up to Z=184 before going into "...". I think that our first priority should be to reform the large table to follow relativistic effects, because as far as the page viewing data is concerned, the large table is the one that people go to. However, if we do decide to continue the large periodic table, I think that we should go beyond the 184 that the compact one goes up to, as people may misconstrue this to be the "end" of the periodic table. Jacob S-589 ( talk) 19:13, 24 September 2013 (UTC)
P.S. on eka-superactinides: Fricke says that 6g, 7f, and 8d are being filled by E184, and later 6h, 10s, and 10p1/2 may fill too. If so, one would expect there to be 68 elements in this series, ending at E240. But given the lack of calculations reaching up to that area (and how do you suppose we would synthesize E240 anyway?), we must take this speculation with several moles of salt. Double sharp ( talk) 08:06, 21 September 2015 (UTC)
Can you define a p1/2 subshell?? Georgia guy ( talk) 19:42, 15 October 2015 (UTC)
Elements up to 369 have known atomic weights. In fact, we know the state of matter of lots of heavy elements. For example, we know that 218 is a solid at room temperature! 108.71.122.60 ( talk) 12:36, 30 September 2016 (UTC)
126 to 134 are all stable. 108.65.81.121 ( talk) 23:44, 21 October 2016 (UTC)
The purpose of an article's talk page (accessible via the talk or discussion tab) is to provide space for editors to discuss changes to its associated article or project page. Article talk pages should not be used by editors as platforms for their personal views on a subject.
The alkali metal article says:
Although a simple extrapolation of the periodic table would put element 169, unhexennium, under ununennium, Dirac-Fock calculations predict that the next alkali metal after ununennium may actually be element 165, unhexpentium, which is predicted to have the electron configuration [Uuo] 5g18 6f14 7d10 8s2 8p1/22 9s1.
I would like to know if anyone objects to a statement like the following in an appropriate section of this article:
Although a simple extrapolation of the periodic table would put the elements after 120 as follows: 121-138 form the g-block superactinoids; 139-152 form the f-block superactinoids, 153-162 would be transition metals; 163-166 p-block metals; 167=halogen; 168=noble gas; 169=alkali metal; 170=alkaline earth metal, Dirac-Fock calculations predict that it will most likely go: 121-140 form the g-block superactinoids; 141-154 form the f-block superactinoids; 155-164 form the transition metals; 165=alkali metal; 166=alkaline earth metal; 167-170 p-block metals; 171=halogen; 172=noble gas.
Any thoughts on where a statement like this can go in the article?? Georgia guy ( talk) 15:20, 16 November 2015 (UTC)
What is special about 184 that makes it the highest atomic number to mention in this article?? Is there a proof that it's impossible (not just difficult, but impossible) to find the atomic number of the highest eka-superactinide?? Georgia guy ( talk) 18:45, 8 December 2015 (UTC)
First of all, a criterion to select a group number is not the number of d-electrons but the number of valence electrons including d-shell. We have 7d109s0 for element 164 as well as 4d105s0 for palladium; elements from 157 to 162 has from 3 to 8 valence electrons (over closed 5g186f148s28p2 shell), as well as elements from lutetium to osmium (over closed 4f14 shell).
Secondly, elements 165 and 166 seem to be too far from being alkali and alkali-earth metals. The soft 7d subshell under valence 9s electrons makes these elements similar to silver and cadmium, and maybe both of them (or at least element 165) could still use their 7d electrons for chemical bonding.
Thirdly, elements 155 and 156 have their 6f subshell still opened for chemical bonding, making them similar to mendelevium and nobelium, so they shouldn't count as 7d-elements.
To make all of that clear, let's remember that all of these elements are metals, so their chemical nature is better described by electronic structure of their cations instead of neutral atoms. When atom is positively ionized, a few things happen:
Thus, for metals the periodic trends are far better described by configurations of dications instead of neutral atoms (after element 122 the given configurations may appear a bit higher than the ground state, but at least they are close to the ground state).
That's why I propose a somewhat simpler and less detailed template for extended periodic table, looking like this:
Note that it has little sense trying to separate 5g and 6f blocks since both of them has quite uncertain starting bounds. However, the 18-electron capacity of 5g yields some correlations along two subsets 121-138 and 139-156 since both of them have 18-element length. Elements of the subset 121-138 have up to 6 valence electrons (like 6f28s28p2 with 8s2 gradually drowning into the core) and are very similar just like lanthanides overall, while the subset 139-156 reminds actinides: first elements has an increasing number of valence electrons (6fk7d28p2), but then 6f subshell is buried down along with 8p, leaving only 7d2 electrons easy to remove (as well as 7s2 electrons in nobelium).
After all, that's not an original research: the corresponding model was introduced in 2006 by Nefedov et.al.; here's the paper: http://www.primefan.ru/stuff/chem/nefedov.pdf
So, again, I propose that simple model with elements 157-172 belonging to groups 3-18 as the best guess to their chemical nature, and elements 121-156 separated as two 18-element subsets according to their complicated electronic structure and overall likeness to lanthanides and actinides, respectively. Droog Andrey ( talk) 12:40, 7 March 2016 (UTC)
121: [118]8s, [118]8s2, [118]8s28p
122: [118]8s, [118]8s2, [118]8s27d, [118]8s27d8p Double sharp ( talk) 15:46, 14 July 2016 (UTC)