Why might oganesson be solid at room temperature?

Oganesson is predicted to be a solid at room temperature due to significant relativistic effects resulting from its high atomic number and large mass.12

With 118 protons, the nuclear charge of oganesson is so intense that its electrons are pulled inward and move at a significant fraction of the speed of light. This "speed limit" effect causes the electrons' effective mass to increase, which fundamentally alters the atom's electronic structure and physical properties.12

While other noble gases are gaseous under standard conditions, these relativistic changes are calculated to give oganesson a melting point of approximately 325 K, making it a solid at room temperature. Additionally, these same effects are expected to make oganesson more reactive than lighter noble gases and potentially exhibit semiconductor behavior.12