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Our gargantuan ab initio all-electron fully relativistic Dirac-Fock (DF),nonrelativistic (NR) Hartree-Fock(HF) and Dirac-Fock-Breit-Gaunt(DFBG)molecular SCF calculations for the superheavy octahedral Oganessonhexatenniside OgTs$_6$ predict atomization energy (Ae) of 9.47, -5.54and 9.37eV, at the optimized Os-Ts bond distances of 3.35, 3.34 and 3.36 angstroms,respectively. There are dramatic effects of relativity for the atomizationenergy of OgTs$_6$ (with seven superheavy elements and 820 electrons) of ~ 15.0eV each at both the DF and DFBG levels of theory, respectively. Our calculatedenergy of reaction for the titled superheavy reaction Og + 3Ts$_2$ -> OgTs$_6$at the DF, NR and DFBG levels of theory is 6.33, 8.81, and 6.26 eV,respectively. Mulliken analysis as implemented in the DIRAC code for our DF andNR calculations (using the dyall.ev4z basis) yields the charges Og(+0.60) andOg(+0.96), respectively on the central Og atom indicating that our relativisticDF calculations predict octahedral OgTs$_6$ to be less ionic. However, duecaution must be used to interpret the results of Mulliken's populationanalysis, which is highly basis set dependent.

Dramatic relativistic and magnetic Breit effects for the superheavy  reaction Og + 3Ts$_2$ -> OgTs$_6$: Prediction of atomization energy and the  existence of the superheavy octahedral Oganesson hexatennesside OgTs$_6$