Flerovium

Flerovium
Name	Flerovium
Atomic number	114
Appearance	unknown
Series	Post-transition metal
Discovered	1998
Discoverers	Joint Institute for Nuclear Research

Flerovium

Flerovium is a synthetic, radioactive element with atomic number 114 and symbol Fl, produced only in particle-accelerator JINR experiments at Dubna and confirmed in collaborative work involving Lawrence Livermore, GSI, and institutions such as the UC Berkeley, Oak Ridge, and the INR RAS. It sits in the region of the periodic table associated with superheavy elements investigated alongside Copernicium, Nihonium, Moscovium, Tennessine, and Oganesson and has been central to studies at facilities like Rutherford Appleton Laboratory and RIKEN.

Introduction

First synthesized in heavy-ion fusion experiments, Flerovium occupies a place in the proposed island of stability theory developed by researchers influenced by work from Maria Goeppert Mayer, Otto Hahn, Lise Meitner, and later theorists such as Glenn T. Seaborg and Walter Greiner. Experimental campaigns at JINR and GSI used projectiles and targets derived from isotopes studied by teams at Lawrence Livermore National Laboratory and techniques pioneered at Berkeley. The element's study involves cross-disciplinary collaborations that include groups at CERN and national laboratories like Los Alamos National Laboratory and draws on theoretical models from researchers associated with JINR and universities such as University of Jyväskylä.

Discovery and Naming

Flerovium was first reported in 1998 by a team at JINR led by scientists who conducted experiments using Californium and Calcium-48 beams; subsequent decay chains were observed and published in collaboration with Lawrence Livermore National Laboratory. The discovery claims led to priority evaluations by the IUPAC and the IUPAP, processes similar to those used for elements such as Roentgenium and Copernicium. The element was named in honor of Georgy Flyorov (also spelled Flerov), founder of the JINR and a key figure in Soviet-era nuclear physics; the naming followed deliberations analogous to those for Einsteinium and Fermium.

Isotopes and Nuclear Properties

Known isotopes include mass numbers synthesized in fusion-evaporation experiments akin to those that produced Darmstadtium and Hassium, with isotopes decaying primarily via alpha emission and spontaneous fission. Measured half-lives for some isotopes extend to seconds or longer, prompting comparisons with isotopes of Lead, Bismuth, and Polonium and discussions referencing nuclear shell models developed by proponents like Mayer and Niels Bohr. Theoretical predictions using macroscopic–microscopic models from groups including Möller and Nix and mean-field calculations by Poves and Nazarewicz explore stability trends and magic numbers near predicted closed shells such as Z = 114, N = 184, debated in literature from Dubna and GSI research teams.

Chemical Properties and Experimental Chemistry

Experimental chemistry of Flerovium has been pursued using gas-phase and adsorption techniques similar to those applied to Copernicium and Rutherfordium. Studies at GSI and JINR used automated rapid chemistry systems inspired by methods from Heinz-Jürgen Mayer’s groups and comparisons to homologues in group 14 like Lead and Tin; results suggested unexpectedly noble-gas-like or volatile behavior, prompting theoretical work by researchers affiliated with University of Mainz and University of Strasbourg. Relativistic quantum chemistry calculations from groups including P. Schwerdtfeger and Walter Greiner indicate strong spin–orbit coupling and relativistic stabilization of the 7p1/2 orbital, affecting predicted oxidation states and bonding akin to analyses performed for Gold and Mercury.

Physical Properties and Predicted Characteristics

Macroscopic physical properties remain unmeasured due to minute production rates, but relativistic calculations predict metallic or weakly metallic behavior with possible low cohesive energy compared to lighter group 14 elements such as Lead and Germanium. Electronic-structure studies by theorists like Pyykkö and Schwerdtfeger project alloying tendencies and surface adsorption energies relevant to experiments at RIKEN and GSI. Predicted crystalline structure, density estimations, and melting-point ranges derive from extrapolations used in modeling superheavy elements by computational teams at institutions including Oak Ridge and University of Vienna.

Synthesis and Production Methods

Flerovium synthesis employs heavy-ion fusion reactions where projectiles like Calcium-48 bombard actinide targets such as Plutonium-244 or Curium-248, following methodologies refined at JINR and GSI. Target preparation and separation techniques use rotating target wheels and gas-filled recoil separators similar to the SHIP setup at GSI and the GARIS system at RIKEN, with decay spectroscopy performed by arrays like those developed at Lawrence Livermore and Oak Ridge. Production yields are extremely low—often a few atoms per week or year—requiring collaborations with facilities like TRIUMF and national laboratories such as KEK for beam time and detector development.

Applications and Research Significance

No practical applications exist due to the short half-lives and scarcity, but Flerovium is crucial for testing nuclear theories and relativistic quantum chemistry models; it informs research at IUPAC-linked committees and international collaborations among groups at JINR, GSI, Lawrence Livermore National Laboratory, and universities like Stockholm University and Technical University of Munich. Studies involving Flerovium contribute to understanding the island of stability debated by scientists from Dubna and Berkeley and drive development of accelerator technology at facilities including CERN, RIKEN, and TRIUMF, as well as detector innovations inspired by work at Los Alamos and Oak Ridge.

Category:Chemical elements Category:Superheavy elements