Wikipedia:Sandbox

If the two heaviest elements in the periodic table had a chance to react, they could form a stable pentatomic molecule, according to the first computational study of its type to examine the properties of a molecule composed of tennessine (element 117) and oganesson (element 118). The relativistic computations indicate that OgTs4 is a stable molecule, likely to adopt tetrahedral geometry, which for this molecule is roughly 1 eV more stable than the square planar version. Omitting the effects of relativity leads to several erroneous predictions, most notably that OgTs4 isn’t stable enough to be bound. During the last decade, there have been numerous investigations of the superheavy elements (SHE) with Z?>?103 . Recently, four superheavy elements (SHE) have been placed in the 7th row of the periodic table including the two heaviest SHE Tennessine Ts (Z?=?117) and Oganesson Og (Z?=?118). This is a landmark event for the scientists working in this area of research and should lead to a renewed interest in the experimental as well as theoretical investigation of the physical and chemical aspects of these heaviest SHE. It is well-recognized that there are problems with the experimental studies of the SHE, due to small production cross section, extra short lifetime, and the access of one atom at a time for chemical study, etc. However, except for a few diatomics of Ts and Og, there are hardly any ab initio all-electron relativistic and nonrelativistic calculations especially for systems of the two heaviest SHE Og and Ts. It is well-known that relativistic effects may be quite pronounced for atomic and molecular systems of SHE, and in the investigation of their electronic structure, bonding, chemical behavior, etc., Schrodinger’s nonrelativistic treatment may be inadequate while Dirac’s relativistic treatment for many-electron systems may be more appropriate for such systems. Dirac–Fock (DF) SCF theory for molecules was developed by Malli and Oreg in 1975 and has been used extensively to investigate the effects of relativity in the chemistry of heavy actinides, and superheavy elements. Recently, we have investigated the effects of relativity on the electronic structure and bonding of numerous systems of heavy and superheavy elements (SHE).