flerovium

flerovium
Name	flerovium
Number	114
Category	post-transition metal (predicted)
Group	14
Appearance	unknown, likely metallic
Atomic weight	[289] (most stable isotope)
Electron configuration	[Rn] 5f14 6d10 7s2 7p2 (predicted)
Phase	solid (predicted)
Melting point	unknown
Boiling point	unknown
Density	unknown

flerovium. It is a superheavy, synthetic element with the atomic number 114 and symbol Fl. The element was first synthesized in 1998 by a team of scientists at the Joint Institute for Nuclear Research in Dubna, Russia, led by Yuri Oganessian. Flerovium is a member of group 14 on the periodic table, positioned below lead, and its chemical properties are predicted to show significant relativistic effects due to its high atomic mass.

Properties

The predicted physical properties of flerovium are highly theoretical due to its extreme instability and the minute quantities produced. Calculations suggest it may be a volatile post-transition metal, potentially a gas or liquid at room temperature, which would be unusual for a group 14 element. These predictions stem from advanced Dirac–Fock calculations and extrapolations from the behavior of lighter homologues like tin and lead. The element's electron configuration is heavily influenced by relativistic effects, which contract the 7s and 7p orbitals, leading to unique potential characteristics such as a lower than expected melting point. Research teams at institutions like the GSI Helmholtz Centre for Heavy Ion Research and RIKEN continue to study these properties through indirect methods.

History

The discovery of flerovium was announced in 1999 by the collaboration between the Joint Institute for Nuclear Research and the Lawrence Livermore National Laboratory. The successful synthesis involved bombarding a target of plutonium-244 with accelerated nuclei of calcium-48 ions. The element was named in 2012 after the Flerov Laboratory of Nuclear Reactions, itself named in honor of Soviet physicist Georgy Flyorov. This naming was ratified by the International Union of Pure and Applied Chemistry, following a period of review and confirmation by the Joint Working Party of IUPAC and the International Union of Pure and Applied Physics. The initial claim was later verified through experiments at the GSI Helmholtz Centre for Heavy Ion Research and other facilities.

Isotopes

Several isotopes of flerovium have been identified, all of which are radioactive and unstable. The most stable known isotope is flerovium-289, with a half-life of approximately 1.9 seconds, produced via the alpha decay of livermorium-293. Other observed isotopes include flerovium-288 and flerovium-290. These isotopes primarily decay through alpha emission to isotopes of copernicium, though some decay chains have shown evidence of spontaneous fission. The study of these isotopes, conducted at facilities like the Joint Institute for Nuclear Research and RIKEN, provides critical data for theories of nuclear stability, particularly the proposed "island of stability" around atomic number 114.

Synthesis and nuclear reactions

Flerovium is produced artificially in particle accelerators through nuclear fusion reactions. The primary method involves bombarding a heavy actinide target, such as plutonium-244 or plutonium-242, with a beam of accelerated calcium-48 ions. These experiments are conducted at specialized laboratories including the Joint Institute for Nuclear Research, the GSI Helmholtz Centre for Heavy Ion Research, and the RIKEN Nishina Center for Accelerator-Based Science. The resulting compound nucleus, flerovium-290 or flerovium-289, is highly excited and cools by emitting one or two neutrons. Detection relies on sophisticated apparatus like the Dubna Gas-Filled Recoil Separator and the TASCA at GSI.

Chemical characteristics

As a member of group 14, flerovium is predicted to be the heaviest homologue of carbon, silicon, germanium, tin, and lead. However, strong relativistic effects are expected to dominate its chemistry, potentially making it more inert and volatile than lead. Theoretical work by scientists like Pekka Pyykkö suggests it may form a stable +2 oxidation state more readily than +4, unlike its lighter congeners. Experimental chemistry is extraordinarily challenging, but preliminary gas-phase studies using the TransActinide Separator and Chemistry Apparatus at GSI have attempted to probe its adsorption behavior on gold surfaces, comparing it to the noble gas radon.

See also

* Oganesson * Livermorium * Moscovium * Nihonium * Copernicium * Superheavy element * Island of stability * Relativistic quantum chemistry

Category:Chemical elements Category:Synthetic elements Category:Post-transition metals