Step by Step Towards the Complete Shell (IMAGE) Karlsruher Institut für Technologie (KIT) Caption Step by step towards the complete shell: formation of a metal cluster from the atomic constituents to the compound. Credit Photo: Dehnen Group, Philipps-Universität Marburg 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.