Oganesson tetratennesside is a theoretical pentatomic molecule with chemical formula OgTs4 and predicted tetrahedral symmetry. It is significant for being the most massive stable pentatomic molecule in theoretical calculations, with an amu of at least 5*(294) = 1470 amu (since both the synthesized 294Og and 294Ts have the same atomic weights), compared to methane (CH4, the least massive stable pentatomic molecule) with 16 amu. This creates a mass ratio between oganesson tetratenneside and methane of 92.

OgTs4 is also significant for relying heavily on relativistic considerations to compute its stability and bonding angles. It was found tetrahedral geometry was preferred over square planar geometry with an energy savings of 1 eV.[1]



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