  Our all-electron fully relativistic Dirac-Fock (DF) and nonrelativistic (NR)
Hartree-Fock (HF) SCF molecular calculations for the superheavy tetrahedral
(T$_d$) oganesson tetratennesside OgT$_4$ predict atomization energy (Ae) of
7.45 and -11.21 eV, respectively. Our DF and NR calculations, however for the
square planar (D$_{4h}$)OsTs$_4$ predict atomization energy (Ae) o 6.34 and
-8.56 ev, respectively. There are dramatic relativistic effects for the
atomization energy of T$_d$ and D$_{4h}$ OgT$_4$ of -18.65 eV and 14.90 eV,
respectively. Whereas our DF calculations predict the T$_d$OgT$_4$ to be more
stable than the D$_{4h}$ OgT$_4$ by ~1.10 eV, our NR calculations predict the
D$_{4h}$ OgT$_4$ to be more stable than the T$_d$ OgT$_4$ by ~2.65eV. Our NR
calculations predict both the T$_d$ and D$_{4h}$ OgTs$_4$ to be unbound by
11.21 and 8.56 eV, respectively. However our relativistic DF calculations
predict both the T$_d$ and D$_{4h}$ OgT$_4$ to be bound by 7.45 and 6.34 eV
respectively and so the relativistic treatment is mandatory for bonding and
binding in the pentatomic superheavy system with 586 electrons involving the
two heaviest SHE Ts and Og.
