Protactinium (IMAGE) DOE/Argonne National Laboratory Caption In a new study, Argonne and University of Lille chemists explored protactinium's multiple resemblances to more completely understand the relationship between the transition metals and the complex chemistry of the early actinide elements. Credit Argonne National Laboratory and Shutterstock/Humdan Usage Restrictions None License Licensed 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.