Ununennium
Theoretical element | ||||||
---|---|---|---|---|---|---|
Ununennium | ||||||
Pronunciation | /ˌuːn.uːnˈɛniəm/ ⓘ | |||||
Alternative names | element 119, eka-francium | |||||
Ununennium in the periodic table | ||||||
| ||||||
kJ/mol (extrapolated)[3] | ||||||
Atomic properties | ||||||
Oxidation states | (+1), (+3), (+5) (predicted)[1][4] | |||||
Electronegativity | Pauling scale: 0.86 (predicted)[5] | |||||
Ionization energies |
| |||||
Atomic radius | empirical: 240 pm (predicted)[1] | |||||
Covalent radius | 263–281 pm (extrapolated)[3] | |||||
Other properties | ||||||
Crystal structure | body-centered cubic (bcc) (extrapolated)[7] | |||||
CAS Number | 54846-86-5 | |||||
History | ||||||
Naming | IUPAC systematic element name | |||||
Isotopes of ununennium | ||||||
Experiments and theoretical calculations | ||||||
Ununennium, also known as eka-francium or element 119, is a hypothetical
An attempt to synthesize the element has been ongoing since 2018 in
Ununennium's position as the seventh alkali metal suggests that it would have similar properties to its lighter
Introduction
Synthesis of superheavy nuclei
A superheavy[a] atomic nucleus is created in a nuclear reaction that combines two other nuclei of unequal size[b] into one; roughly, the more unequal the two nuclei in terms of mass, the greater the possibility that the two react.[13] The material made of the heavier nuclei is made into a target, which is then bombarded by the beam of lighter nuclei. Two nuclei can only fuse into one if they approach each other closely enough; normally, nuclei (all positively charged) repel each other due to electrostatic repulsion. The strong interaction can overcome this repulsion but only within a very short distance from a nucleus; beam nuclei are thus greatly accelerated in order to make such repulsion insignificant compared to the velocity of the beam nucleus.[14] The energy applied to the beam nuclei to accelerate them can cause them to reach speeds as high as one-tenth of the speed of light. However, if too much energy is applied, the beam nucleus can fall apart.[14]
Coming close enough alone is not enough for two nuclei to fuse: when two nuclei approach each other, they usually remain together for approximately 10−20 seconds and then part ways (not necessarily in the same composition as before the reaction) rather than form a single nucleus.[14][15] This happens because during the attempted formation of a single nucleus, electrostatic repulsion tears apart the nucleus that is being formed.[14] Each pair of a target and a beam is characterized by its cross section—the probability that fusion will occur if two nuclei approach one another expressed in terms of the transverse area that the incident particle must hit in order for the fusion to occur.[c] This fusion may occur as a result of the quantum effect in which nuclei can tunnel through electrostatic repulsion. If the two nuclei can stay close for past that phase, multiple nuclear interactions result in redistribution of energy and an energy equilibrium.[14]
External videos | |
---|---|
Visualization of unsuccessful nuclear fusion, based on calculations from the Australian National University[17] |
The resulting merger is an excited state[18]—termed a compound nucleus—and thus it is very unstable.[14] To reach a more stable state, the temporary merger may fission without formation of a more stable nucleus.[19] Alternatively, the compound nucleus may eject a few neutrons, which would carry away the excitation energy; if the latter is not sufficient for a neutron expulsion, the merger would produce a gamma ray. This happens in approximately 10−16 seconds after the initial nuclear collision and results in creation of a more stable nucleus.[19] The definition by the IUPAC/IUPAP Joint Working Party (JWP) states that a chemical element can only be recognized as discovered if a nucleus of it has not decayed within 10−14 seconds. This value was chosen as an estimate of how long it takes a nucleus to acquire its outer electrons and thus display its chemical properties.[20][d]
Decay and detection
The beam passes through the target and reaches the next chamber, the separator; if a new nucleus is produced, it is carried with this beam.[22] In the separator, the newly produced nucleus is separated from other nuclides (that of the original beam and any other reaction products)[e] and transferred to a surface-barrier detector, which stops the nucleus. The exact location of the upcoming impact on the detector is marked; also marked are its energy and the time of the arrival.[22] The transfer takes about 10−6 seconds; in order to be detected, the nucleus must survive this long.[25] The nucleus is recorded again once its decay is registered, and the location, the energy, and the time of the decay are measured.[22]
Stability of a nucleus is provided by the strong interaction. However, its range is very short; as nuclei become larger, its influence on the outermost nucleons (protons and neutrons) weakens. At the same time, the nucleus is torn apart by electrostatic repulsion between protons, and its range is not limited.[26] Total binding energy provided by the strong interaction increases linearly with the number of nucleons, whereas electrostatic repulsion increases with the square of the atomic number, i.e. the latter grows faster and becomes increasingly important for heavy and superheavy nuclei.[27][28] Superheavy nuclei are thus theoretically predicted[29] and have so far been observed[30] to predominantly decay via decay modes that are caused by such repulsion: alpha decay and spontaneous fission.[f] Almost all alpha emitters have over 210 nucleons,[32] and the lightest nuclide primarily undergoing spontaneous fission has 238.[33] In both decay modes, nuclei are inhibited from decaying by corresponding energy barriers for each mode, but they can be tunnelled through.[27][28]
Alpha particles are commonly produced in radioactive decays because mass of an alpha particle per nucleon is small enough to leave some energy for the alpha particle to be used as kinetic energy to leave the nucleus.
Alpha decays are registered by the emitted alpha particles, and the decay products are easy to determine before the actual decay; if such a decay or a series of consecutive decays produces a known nucleus, the original product of a reaction can be easily determined.[h] (That all decays within a decay chain were indeed related to each other is established by the location of these decays, which must be in the same place.)[22] The known nucleus can be recognized by the specific characteristics of decay it undergoes such as decay energy (or more specifically, the kinetic energy of the emitted particle).[i] Spontaneous fission, however, produces various nuclei as products, so the original nuclide cannot be determined from its daughters.[j]
The information available to physicists aiming to synthesize a superheavy element is thus the information collected at the detectors: location, energy, and time of arrival of a particle to the detector, and those of its decay. The physicists analyze this data and seek to conclude that it was indeed caused by a new element and could not have been caused by a different nuclide than the one claimed. Often, provided data is insufficient for a conclusion that a new element was definitely created and there is no other explanation for the observed effects; errors in interpreting data have been made.[k]History
Synthesis attempts
Elements 114 to 118 (flerovium through oganesson) were discovered in "hot fusion" reactions at the Joint Institute for Nuclear Research (JINR) in Dubna, Russia. This involved bombarding the actinides plutonium through californium with calcium-48, a quasi-stable neutron-rich isotope which could be used as a projectile to produce more neutron-rich isotopes of superheavy elements.[51] (The term "hot" refers to the high excitation energy of the resulting compound nucleus.) This cannot easily be continued to element 119, because it would require a target of the next actinide einsteinium. Tens of milligrams of einsteinium would be needed for a reasonable chance of success, but only micrograms have so far been produced.[52] An attempt to make element 119 from calcium-48 and less than a microgram of einsteinium was made in 1985 at the superHILAC accelerator at Berkeley, California, but did not succeed.[53]
- 254
99Es
+ 48
20Ca
→ 302
119Uue
* → no atoms
More practical production of further superheavy elements requires projectiles heavier than 48Ca,[51] but this makes the reaction more symmetric[54] and gives it a smaller chance of success.[52] Attempts to synthesize element 119 push the limits of current technology, due to the decreasing cross sections of the production reactions and the probably short half-lives of produced isotopes,[55] expected to be on the order of microseconds.[1][56]
From April to September 2012, an attempt to synthesize the isotopes 295Uue and 296Uue was made by bombarding a target of berkelium-249 with titanium-50 at the GSI Helmholtz Centre for Heavy Ion Research in Darmstadt, Germany.[57][58] This reaction between 249Bk and 50Ti was predicted to be the most favorable practical reaction for formation of ununennium,[58] as it is the most asymmetric reaction available.[55] Moreover, as berkelium-249 decays to californium-249 (the next element) with a short half-life of 327 days, this allowed elements 119 and 120 to be searched for simultaneously.[54] Due to the predicted short half-lives, the GSI team used new "fast" electronics capable of registering decay events within microseconds.[58][55]
- 249
97Bk
+ 50
22Ti
→ 299
119Uue
* → no atoms - 249
98Cf
+ 50
22Ti
→ 299
120Ubn
* → no atoms
Neither element 119 nor element 120 was observed.[59][54] The experiment was originally planned to continue to November 2012,[60] but was stopped early to make use of the 249Bk target to confirm the synthesis of tennessine (thus changing the projectiles to 48Ca).[59]
The team at RIKEN in Wakō, Japan began bombarding curium-248 targets with a vanadium-51 beam in January 2018[61] to search for element 119. Curium was chosen as a target, rather than heavier berkelium or californium, as these heavier targets are difficult to prepare.[62] The 248Cm targets were provided by Oak Ridge National Laboratory. RIKEN developed a high-intensity vanadium beam.[52] The experiment began at a cyclotron while RIKEN upgraded its linear accelerators; the upgrade was completed in 2020.[63] Bombardment may be continued with both machines until the first event is observed; the experiment is currently running intermittently for at least 100 days per year.[64][62] The RIKEN team's efforts are being financed by the Emperor of Japan.[65]
- 248
96Cm
+ 51
23V
→ 299
119Uue
* → no atoms yet
The produced isotopes of ununennium are expected to undergo two alpha decays to known isotopes of moscovium, 287Mc and 288Mc. This would anchor them to a known sequence of five or six further alpha decays, respectively, and corroborate their production.[61][66]
As of September 2023, the team at RIKEN had run the 248Cm+51V reaction for 462 days. A report by the RIKEN Nishina Center Advisory Committee noted that this reaction was chosen because of the availability of the target and projectile materials, despite predictions favoring the 249Bk+50Ti reaction, owing to the 50Ti projectile being closer to doubly magic 48Ca and having an even atomic number (22); reactions with even-Z projectiles have generally been shown to have greater cross-sections. The report recommended that if the 5 fb cross-section limit is reached without any events observed, then the team should "evaluate and eventually reconsider the experimental strategy before taking additional beam time."[67]
The team at the JINR plans to attempt synthesis of element 119 in the future, but a precise timeframe has not been publicly released.
Naming
Using
Predicted properties
Nuclear stability and isotopes
The stability of nuclei decreases greatly with the increase in atomic number after
The alpha-decay half-lives predicted for 291–307Uue are on the order of microseconds. The longest alpha-decay half-life predicted is ~485 microseconds for the isotope 294Uue.
Atomic and physical
Being the first
The main reason for the predicted differences between ununennium and the other alkali metals is the spin–orbit (SO) interaction—the mutual interaction between the electrons' motion and spin. The SO interaction is especially strong for the superheavy elements because their electrons move faster—at speeds comparable to the speed of light—than those in lighter atoms.[80] In ununennium atoms, it lowers the 7p and 8s electron energy levels, stabilizing the corresponding electrons, but two of the 7p electron energy levels are more stabilized than the other four.[81] The effect is called subshell splitting, as it splits the 7p subshell into more-stabilized and the less-stabilized parts. Computational chemists understand the split as a change of the second (azimuthal) quantum number ℓ from 1 to 1⁄2 and 3⁄2 for the more-stabilized and less-stabilized parts of the 7p subshell, respectively.[80][l] Thus, the outer 8s electron of ununennium is stabilized and becomes harder to remove than expected, while the 7p3/2 electrons are correspondingly destabilized, perhaps allowing them to participate in chemical reactions.[1] This stabilization of the outermost s-orbital (already significant in francium) is the key factor affecting ununennium's chemistry, and causes all the trends for atomic and molecular properties of alkali metals to reverse direction after caesium.[5]
Due to the stabilization of its outer 8s electron, ununennium's first
The electron of the
Ununennium is predicted to have a melting point between 0 °C and 30 °C: thus it may be a liquid at room temperature.[6] It is not known whether this continues the trend of decreasing melting points down the group, as caesium's melting point is 28.5 °C and francium's is estimated to be around 8.0 °C.[86] The boiling point of ununennium is expected to be around 630 °C, similar to that of francium, estimated to be around 620 °C; this is lower than caesium's boiling point of 671 °C.[2][86] The density of ununennium has been variously predicted to be between 3 and 4 g/cm3, continuing the trend of increasing density down the group: the density of francium is estimated at 2.48 g/cm3, and that of caesium is known to be 1.93 g/cm3.[2][3][86]
Chemical
Dimer | Bond length (Å) |
Bond-dissociation energy (kJ/mol) |
---|---|---|
Li2 | 2.673 | 101.9 |
Na2 | 3.079 | 72.04 |
K2 | 3.924 | 53.25 |
Rb2 | 4.210 | 47.77 |
Cs2 | 4.648 | 43.66 |
Fr2 | ~ 4.61 | ~ 42.1 |
Uue2 | ~ 4.27 | ~ 53.4 |
The chemistry of ununennium is predicted to be similar to that of the alkali metals,
The chemistry of ununennium in the +1-oxidation state should be more similar to the chemistry of rubidium than to that of francium. On the other hand, the ionic radius of the Uue+ ion is predicted to be larger than that of Rb+, because the 7p orbitals are destabilized and are thus larger than the p-orbitals of the lower shells. Ununennium may also show the +3 oxidation state,[1] which is not seen in any other alkali metal,[89] in addition to the +1 oxidation state that is characteristic of the other alkali metals and is also the main oxidation state of all the known alkali metals: this is because of the destabilization and expansion of the 7p3/2 spinor, causing its outermost electrons to have a lower ionization energy than what would otherwise be expected.[1][89] The 7p3/2 spinor's chemical activity has been suggested to make the +5 oxidation state possible in [UueF6]−, analogous to [SbF6]− or [BrF6]−. The analogous francium(V) compound, [FrF6]−, might also be achievable, but is not experimentally known.[4]
Many ununennium compounds are expected to have a large
Bond lengths and bond-dissociation energies of MAu (M = an alkali metal). All data are predicted, except for the bond-dissociation energies of KAu, RbAu, and CsAu.[5] Compound Bond length
(Å)Bond-dissociation
energy (kJ/mol)KAu 2.856 2.75 RbAu 2.967 2.48 CsAu 3.050 2.53 FrAu 3.097 2.75 UueAu 3.074 2.44
In the gas phase, and at very low temperatures in the condensed phase, the alkali metals form covalently bonded diatomic molecules. The metal–metal bond lengths in these M2 molecules increase down the group from Li2 to Cs2, but then decrease after that to Uue2, due to the aforementioned relativistic effects that stabilize the 8s orbital. The opposite trend is shown for the metal–metal bond-dissociation energies. The Uue–Uue bond should be slightly stronger than the K–K bond.[5][87] From these M2 dissociation energies, the enthalpy of sublimation (ΔHsub) of ununennium is predicted to be 94 kJ/mol (the value for francium should be around 77 kJ/mol).[5]
The UueF molecule is expected to have a significant covalent character owing to the high electron affinity of ununennium. The bonding in UueF is predominantly between a 7p orbital on ununennium and a 2p orbital on fluorine, with lesser contributions from the 2s orbital of fluorine and the 8s, 6dz2, and the two other 7p orbitals of ununennium. This is very different from the behaviour of s-block elements, as well as
See also
Notes
- superactinide series).[10]Terms "heavy isotopes" (of a given element) and "heavy nuclei" mean what could be understood in the common language—isotopes of high mass (for the given element) and nuclei of high mass, respectively.
- ^ The amount of energy applied to the beam particle to accelerate it can also influence the value of cross section. For example, in the 28
14Si
+ 1
0n
→ 28
13Al
+ 1
1p
reaction, cross section changes smoothly from 370 mb at 12.3 MeV to 160 mb at 18.3 MeV, with a broad peak at 13.5 MeV with the maximum value of 380 mb.[16] - ^ This figure also marks the generally accepted upper limit for lifetime of a compound nucleus.[21]
- ^ This separation is based on that the resulting nuclei move past the target more slowly then the unreacted beam nuclei. The separator contains electric and magnetic fields whose effects on a moving particle cancel out for a specific velocity of a particle.[23] Such separation can also be aided by a time-of-flight measurement and a recoil energy measurement; a combination of the two may allow to estimate the mass of a nucleus.[24]
- ^ Not all decay modes are caused by electrostatic repulsion. For example, beta decay is caused by the weak interaction.[31]
- ^ It was already known by the 1960s that ground states of nuclei differed in energy and shape as well as that certain magic numbers of nucleons corresponded to greater stability of a nucleus. However, it was assumed that there was no nuclear structure in superheavy nuclei as they were too deformed to form one.[36]
- ^ Since mass of a nucleus is not measured directly but is rather calculated from that of another nucleus, such measurement is called indirect. Direct measurements are also possible, but for the most part they have remained unavailable for superheavy nuclei.[41] The first direct measurement of mass of a superheavy nucleus was reported in 2018 at LBNL.[42] Mass was determined from the location of a nucleus after the transfer (the location helps determine its trajectory, which is linked to the mass-to-charge ratio of the nucleus, since the transfer was done in presence of a magnet).[43]
- ^ If the decay occurred in a vacuum, then since total momentum of an isolated system before and after the decay must be preserved, the daughter nucleus would also receive a small velocity. The ratio of the two velocities, and accordingly the ratio of the kinetic energies, would thus be inverse to the ratio of the two masses. The decay energy equals the sum of the known kinetic energy of the alpha particle and that of the daughter nucleus (an exact fraction of the former).[32] The calculations hold for an experiment as well, but the difference is that the nucleus does not move after the decay because it is tied to the detector.
- Georgy Flerov,[44] a leading scientist at JINR, and thus it was a "hobbyhorse" for the facility.[45] In contrast, the LBL scientists believed fission information was not sufficient for a claim of synthesis of an element. They believed spontaneous fission had not been studied enough to use it for identification of a new element, since there was a difficulty of establishing that a compound nucleus had only ejected neutrons and not charged particles like protons or alpha particles.[21] They thus preferred to link new isotopes to the already known ones by successive alpha decays.[44]
- ^ For instance, element 102 was mistakenly identified in 1957 at the Nobel Institute of Physics in Stockholm, Stockholm County, Sweden.[46] There were no earlier definitive claims of creation of this element, and the element was assigned a name by its Swedish, American, and British discoverers, nobelium. It was later shown that the identification was incorrect.[47] The following year, RL was unable to reproduce the Swedish results and announced instead their synthesis of the element; that claim was also disproved later.[47] JINR insisted that they were the first to create the element and suggested a name of their own for the new element, joliotium;[48] the Soviet name was also not accepted (JINR later referred to the naming of the element 102 as "hasty").[49] This name was proposed to IUPAC in a written response to their ruling on priority of discovery claims of elements, signed 29 September 1992.[49] The name "nobelium" remained unchanged on account of its widespread usage.[50]
- ^ The quantum number corresponds to the letter in the electron orbital name: 0 to s, 1 to p, 2 to d, etc. See azimuthal quantum number for more information.
References
- ^ ISBN 978-1-4020-3555-5.
- ^ a b c d Fricke, B.; Waber, J. T. (1971). "Theoretical Predictions of the Chemistry of Superheavy Elements" (PDF). Actinides Reviews. 1: 433–485. Retrieved 7 August 2013.
- ^ .
- ^ . Retrieved 16 November 2022.
- ^ . This article gives the Mulliken electronegativity as 2.72, which has been converted to the Pauling scale via χP = 1.35χM1/2 − 1.37.
- ^ ISBN 978-3-540-07109-9. Retrieved 4 October 2013.
- . Retrieved 22 February 2018.
- ^ Krämer, K. (2016). "Explainer: superheavy elements". Chemistry World. Retrieved 2020-03-15.
- ^ "Discovery of Elements 113 and 115". Lawrence Livermore National Laboratory. Archived from the original on 2015-09-11. Retrieved 2020-03-15.
- S2CID 127060181.
- ISSN 0556-2813.
- S2CID 123288075. Archived from the original(PDF) on 7 June 2015. Retrieved 20 October 2012.
- ^ Subramanian, S. (28 August 2019). "Making New Elements Doesn't Pay. Just Ask This Berkeley Scientist". Bloomberg Businessweek. Retrieved 2020-01-18.
- ^ a b c d e f Ivanov, D. (2019). "Сверхтяжелые шаги в неизвестное" [Superheavy steps into the unknown]. nplus1.ru (in Russian). Retrieved 2020-02-02.
- ^ Hinde, D. (2017). "Something new and superheavy at the periodic table". The Conversation. Retrieved 2020-01-30.
- .
- ISSN 2100-014X.
- ISBN 978-0-471-76862-3.
- ^ S2CID 28796927.
- S2CID 95737691.
- ^ S2CID 99193729.
- ^ a b c d Chemistry World (2016). "How to Make Superheavy Elements and Finish the Periodic Table [Video]". Scientific American. Retrieved 2020-01-27.
- ^ Hoffman, Ghiorso & Seaborg 2000, p. 334.
- ^ Hoffman, Ghiorso & Seaborg 2000, p. 335.
- ^ Zagrebaev, Karpov & Greiner 2013, p. 3.
- ^ Beiser 2003, p. 432.
- ^ a b Pauli, N. (2019). "Alpha decay" (PDF). Introductory Nuclear, Atomic and Molecular Physics (Nuclear Physics Part). Université libre de Bruxelles. Retrieved 2020-02-16.
- ^ a b c d e Pauli, N. (2019). "Nuclear fission" (PDF). Introductory Nuclear, Atomic and Molecular Physics (Nuclear Physics Part). Université libre de Bruxelles. Retrieved 2020-02-16.
- ISSN 0556-2813.
- ^ Audi et al. 2017, pp. 030001-129–030001-138.
- ^ Beiser 2003, p. 439.
- ^ a b Beiser 2003, p. 433.
- ^ Audi et al. 2017, p. 030001-125.
- S2CID 125849923.
- ^ Beiser 2003, p. 432–433.
- ^ ISSN 1742-6596.
- ^ Moller, P.; Nix, J. R. (1994). Fission properties of the heaviest elements (PDF). Dai 2 Kai Hadoron Tataikei no Simulation Symposium, Tokai-mura, Ibaraki, Japan. University of North Texas. Retrieved 2020-02-16.
- ^ . Retrieved 2020-02-16.
- PMID 25666065.
- Bibcode:1989nufi.rept...16H.
- S2CID 119531411.
- S2CID 239775403.
- ^ Howes, L. (2019). "Exploring the superheavy elements at the end of the periodic table". Chemical & Engineering News. Retrieved 2020-01-27.
- ^ Distillations. Retrieved 2020-02-22.
- ^ "Популярная библиотека химических элементов. Сиборгий (экавольфрам)" [Popular library of chemical elements. Seaborgium (eka-tungsten)]. n-t.ru (in Russian). Retrieved 2020-01-07. Reprinted from "Экавольфрам" [Eka-tungsten]. Популярная библиотека химических элементов. Серебро – Нильсборий и далее [Popular library of chemical elements. Silver through nielsbohrium and beyond] (in Russian). Nauka. 1977.
- ^ "Nobelium - Element information, properties and uses | Periodic Table". Royal Society of Chemistry. Retrieved 2020-03-01.
- ^ a b Kragh 2018, pp. 38–39.
- ^ Kragh 2018, p. 40.
- ^ (PDF) from the original on 25 November 2013. Retrieved 7 September 2016.
- .
- ^ S2CID 119275964.
- ^ S2CID 253391052. Retrieved 13 November 2022.
- PMID 9953034. Retrieved 21 March 2022.
- ^ S2CID 229401931. Retrieved 25 January 2021.
- ^ a b c d Zagrebaev, Karpov & Greiner 2013.
- ^ ISBN 978-3-319-00046-6.
- ^ Modern alchemy: Turning a line, The Economist, May 12, 2012.
- ^ ISBN 978-981-4525-42-8. Retrieved 21 March 2022.
- ^ a b "Superheavy Element Research at TASCA" (PDF). Retrieved 2024-01-26.
- ^ "Search for element 119: Christoph E. Düllmann for the TASCA E119 collaboration" (PDF). Archived from the original (PDF) on 2016-03-04. Retrieved 2015-09-15.
- ^ PMID 36533209.
- ^ a b Sakai, Hideyuki (27 February 2019). "Search for a New Element at RIKEN Nishina Center" (PDF). infn.it. Retrieved 17 December 2019.
- ^ Sakurai, Hiroyoshi (1 April 2020). "Greeting | RIKEN Nishina Center".
With the completion of the upgrade of the linear accelerator and BigRIPS at the beginning of 2020, the RNC aims to synthesize new elements from element 119 and beyond.
- S2CID 59524524.
We started the search for element 119 last June," says RIKEN researcher Hideto En'yo. "It will certainly take a long time — years and years — so we will continue the same experiment intermittently for 100 or more days per year, until we or somebody else discovers it.
- ^ Chapman, Kit; Turner, Kristy (13 February 2018). "The hunt is on". Education in Chemistry. Royal Society of Chemistry. Retrieved 28 June 2019.
The hunt for element 113 was almost abandoned because of lack of resources, but this time Japan's emperor is bankrolling Riken's efforts to extend the periodic table to its eighth row.
- S2CID 254435744.
- ^ "RIKEN Nishina Center Advisory Committee Report" (PDF). riken.jp. Riken. 7 September 2023. Retrieved 11 April 2024.
- ^ Joint Institute for Nuclear Research (24 July 2021). "JINR presented largest Periodic Table to Dubna". jinr.ru. Joint Institute for Nuclear Research. Retrieved 27 January 2022.
- ^ "В ЛЯР ОИЯИ впервые в мире синтезирован ливерморий-288" [Livermorium-288 was synthesized for the first time in the world at FLNR JINR] (in Russian). Joint Institute for Nuclear Research. 23 October 2023. Retrieved 18 November 2023.
- ^ "Superheavy Element Factory: overview of obtained results". Joint Institute for Nuclear Research. 24 August 2023. Retrieved 7 December 2023.
- arXiv:2402.15304v1 [nucl-th].
- .
- .
- ^ a b Kratz, J. V. (5 September 2011). The Impact of Superheavy Elements on the Chemical and Physical Sciences (PDF). 4th International Conference on the Chemistry and Physics of the Transactinide Elements. Retrieved 27 August 2013.
- S2CID 4415582.
- OCLC 223349096.
- S2CID 7496348.
- S2CID 119207807.
- S2CID 96718440.
- ^ ISBN 978-1-4020-9974-8.
- .
- ^ S2CID 31590563.
- ^ . Retrieved 15 September 2015.
- ^ PMID 23556718.
- .
- ^ ISBN 978-0-250-39923-9.
- ^ ISBN 9783527335411.
- ^ a b Seaborg (c. 2006). "transuranium element (chemical element)". Encyclopædia Britannica. Retrieved 2010-03-16.
- ^ ISBN 978-0-08-037941-8.
- . Retrieved 14 January 2018.
Bibliography
- Audi, G.; Kondev, F. G.; Wang, M.; et al. (2017). "The NUBASE2016 evaluation of nuclear properties" (PDF). Chinese Physics C. 41 (3): 030001. .
- Beiser, A. (2003). Concepts of modern physics (6th ed.). McGraw-Hill. OCLC 48965418.
- ISBN 978-1-78-326244-1.
- ISBN 978-3-319-75813-8.
- Zagrebaev, V.; Karpov, A.; Greiner, W. (2013). "Future of superheavy element research: Which nuclei could be synthesized within the next few years?". S2CID 55434734.
External links
- The dictionary definition of ununennium at Wiktionary