[en] The x-ray spectra of highly ionized neon-like rhodium, lanthanum and gold are observed by accelerating these ions to relativistic velocities and then passing them through thin target foils. Transition energies measured are compared with theoretical multi-configuration Dirac-Fock calculations. Good agreement is observed for most of the transition energies measured at the level of the experimental accuracy, (λ/Δλ /approximately/ 2000), although consistent variations along the isoelectronic sequence on neon-like transitions to the ground state having an initial state with a 2s hole are observed. This result indicates the inadequate theoretical treatment of the multielectron quantum electrodynamic self energy contributions to these atomic energy level states. 20 refs., 50 figs., 31 tabs