Promethium surrounded by organic ligand (IMAGE) DOE/Oak Ridge National Laboratory Caption Conceptual art shows the rare earth element promethium in a vial surrounded by an organic ligand. ORNL scientists have discovered hidden features of promethium, opening a pathway for research into other lanthanide elements. Credit Jacquelyn DeMink, art; Thomas Dyke, photography; ORNL, U.S. Dept. of Energy Usage Restrictions None License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.