Orbital collapse of the 5$g$-electrons in the superheavy elements of the 8th period

The presence of the orbital collapse of the $g$-orbitals in the excited state of the atom with the nuclear charge number $Z$ = 124 and in the ground state of the atom with $Z$ = 125, which belong to the 8th period of the extended periodic table, is demonstrated. In both cases, the orbital collapse occurs within the same configuration when increasing the total angular momentum $J$, which characterizes the relativistic term of the atom in the $jj$ coupling. All calculations are performed by means of the relativistic Dirac–Fock method.