Rhóniumbased
Rhóniumbased is a hypothetical chemical element with the symbol Rhn and atomic number 121. It is positioned as the first element in the superactinide series. As a superactinide, rhóniumbased is expected to possess unique electronic configurations that distinguish it from the actinides and lanthanides. Theoretical calculations suggest that its electron configuration may involve the filling of the 5g orbitals, a subshell not occupied by electrons in any known element.
Due to its extremely high atomic number, rhóniumbased is predicted to be highly unstable and radioactive, with
The existence and properties of rhóniumbased are subjects of ongoing theoretical research within nuclear physics and