Synthetic ionization

An international collaboration has measured the first ionization energy of the heaviest actinide lawrencium - the synthetic radioactive element 103. Led by researchers from the Japan Atomic Energy Agency (JAEA) in Tokai, the team obtained a value of 4.96 electronvolts. "We found that the energy required to remove the outermost electron in lawrencium was the lowest among all the actinides," explains team member Christoph Düllmann of Johannes Gutenberg University Mainz (JGU), Germany. The measurement confirms the position of lawrencium as the last actinide and also vindicates the structure of the periodic table of elements.