Why Can't Neodymium Be More like Tin? (image) Joint Quantum Institute Caption The best highly charged ions seem to be atoms such as Nd, Pr, and Sm that can be ionized to have the same number of electrons as four successive elements -- Ag, Cd, In, and Sn -- in another part of the periodic table. Credit Adapted from Los Alamos figure Usage Restrictions None 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.