Livermorium
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| Livermorium | |
|---|---|
| Name | Livermorium |
| Atomic number | 116 |
| Category | Post-transition metal (predicted) |
| Appearance | unknown |
| Discovered | 2000–2004 |
| Discovered by | Joint Institute for Nuclear Research; Lawrence Livermore National Laboratory |
| Named after | Lawrence Livermore National Laboratory |
Livermorium is a synthetic, radioactive, superheavy element with atomic number 116. It is produced in particle accelerators through heavy-ion fusion reactions and exists only in trace quantities as short-lived isotopes. Research into its synthesis, nuclear properties, and chemistry involves collaborations among laboratories, theoretical physicists, and chemists using techniques from nuclear physics, quantum chemistry, and relativistic quantum mechanics.
Introduction
Livermorium occupies a position in the periodic table near Polonium, Astatine, Bismuth, and Lead, placing it in discussions about the behavior of the heaviest p-block elements and the limits of nuclear stability associated with the island of stability hypothesis. Experiments and theoretical models draw on methods developed at institutions such as the Joint Institute for Nuclear Research, Lawrence Livermore National Laboratory, GSI Helmholtz Centre for Heavy Ion Research, RIKEN, and CERN. Studies connect to broader topics including the synthesis techniques pioneered in work on Seaborgium, Bohrium, Copernicium, Flerovium, and Oganesson.
Discovery and Naming
The first claims relevant to element 116 emerged from experiments at the Joint Institute for Nuclear Research in Dubna using targets and projectiles also used in the discovery of other transactinides, following earlier programs at Lawrence Berkeley National Laboratory and proposals from groups at Oak Ridge National Laboratory and the University of California, Berkeley. Confirmatory work involved measurements of decay chains linking to known nuclides such as isotopes of Flerovium and Roentgenium. The element was synthesized in bombardments that mirrored techniques used for Mendelevium and Nobelium, with experimental apparatus and detection systems comparable to those employed in experiments at Gesellschaft für Schwerionenforschung (now GSI Helmholtz Centre for Heavy Ion Research) and RIKEN Nishina Center for Accelerator-Based Science. In recognition of the collaboration and contributions from US laboratories, the element was named after Lawrence Livermore National Laboratory; the naming process followed procedures established by the International Union of Pure and Applied Chemistry.
Isotopes and Nuclear Properties
Observed isotopes of element 116 have been reported with mass numbers in the region of 290–{(} as determined in decay chains influenced by alpha decay and spontaneous fission modes). Measured alpha decay energies and half-lives connect to decay sequences that include nuclides such as isotopes of Flerovium, Darmstadtium, Hassium, and Meitnerium, permitting assignment of parentage through correlation techniques developed in experiments on Rutherfordium and Dubnium. Nuclear shell-model calculations and macroscopic-microscopic approaches reference predicted closed shells at proton number 114 and neutron number 184, relating to the concept of the island of stability and models applied to elements up to Oganesson. Studies use input from mass models like the FRDM (finite-range droplet model), Hartree–Fock–Bogoliubov calculations, and data compilations maintained by collaborations including the National Nuclear Data Center.
Predicted Chemical Properties and Bonding
Predictions for chemical behavior rely heavily on relativistic quantum chemistry techniques that extend methods applied to Polonium and Astatine. Calculations anticipate that element 116 may display properties analogous to post-transition metals, drawing comparisons with Lead and Bismuth as well as homologs Polonium and Tellurium. Relativistic effects studied in contexts such as the chemistry of Gold and Mercury are expected to modify orbital energies, spin–orbit splitting, and s-orbital contraction for element 116, altering trends familiar from groups containing Oxygen-group and Carbon-group elements. Bonding models reference methods used to predict complexes of Flerovium and Copernicium, and predictions consider potential oxidation states informed by chemistry of Polonium and investigations into the heavier congeners performed by researchers from institutions like Paul Scherrer Institute and university groups involved in superheavy-element chemistry.
Experimental Chemistry and Synthesis Attempts
Experimental chemistry has focused on single-atom techniques and rapid automated chemical separation methods developed for investigations of elements such as Seaborgium, Bohrium, Hassium, and Flerovium. Gas-phase chromatography, liquid-phase extraction, and on-line detection systems adapted from studies of Rutherfordium and Copernicium are applied to attempt chemical characterization. Synthesis attempts employ heavy-ion fusion reactions using projectiles and targets like isotopes of Calcium and Plutonium, following reaction schemes similar to those used in the discovery of Element 114 and Element 118. Detection strategies exploit correlations between implantation events and decay chains linked to known nuclides such as Nihonium and Moscovium.
Theoretical Studies and Relativistic Effects
Theoretical investigations of element 116 use techniques including relativistic density functional theory, Dirac–Hartree–Fock, multi-reference configuration interaction, and coupled-cluster methods—approaches that have been applied to heavy-element systems like Gold, Mercury, Copernicium, and Oganesson. Studies evaluate scalar-relativistic and spin–orbit contributions, Breit interaction corrections, and quantum electrodynamics effects that influence predicted spectra, ionization potentials, and electron affinities. Comparisons are made to computational results for Polonium and Flerovium, and to experimental trends established for transactinides at facilities such as GSI Helmholtz Centre for Heavy Ion Research and RIKEN.
Safety and Handling Considerations
All work with element 116 involves radiological safety frameworks and protocols developed at national laboratories including Lawrence Livermore National Laboratory, Oak Ridge National Laboratory, and Los Alamos National Laboratory, and follows standards from regulatory bodies like the International Atomic Energy Agency for handling radionuclides. Practical handling is constrained by production rates and half-lives, so experiments use remote manipulators, gloveboxes, hot cells, and automated chemistry apparatus similar to equipment at Joint Institute for Nuclear Research and GSI Helmholtz Centre for Heavy Ion Research. Waste management and contamination controls utilize procedures consistent with practices at European Organization for Nuclear Research and other accelerator facilities.