New Elements: Americium-243 Target Atom (IMAGE) DOE/Lawrence Livermore National Laboratory Caption One of the numerous americium-243 target atoms with a nucleus of protons and neutrons surrounded by an electron cloud. Credit Illustration credit: Thomas Tegge, Lawrence Livermore National Laboratory. Usage Restrictions Image courtesy of Lawrence Livermore National Laboratory. Use of image shall not claim any expressed or implied affiliation with, or endorsement by, Lawrence Livermore National Laboratory. 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.