In this scheme, 223Ra was named actinium X (AcX), 224Ra thorium X (ThX), 226Ra radium (Ra), and 228Ra mesothorium 1 (MsTh1).
Në këtë skemë, 223Ra u emërua actinium X (AcX), 224Ra torium X (ThX), 226Ra radium (Ra) dhe 228Ra mesothorium 1 (MsTh1).