Livermorium

Livermorium is element 116. The Joint Institute for Nuclear Research in Dubna, Russia, and Lawrence Livermore National Laboratory in California made it in 2000 by firing calcium-48 nuclei at a target of curium. It was named in 2012 after the Livermore laboratory, honoring its decades of work on heavy elements.

The fusion that creates it is so rare that atoms are detected one at a time, after weeks of bombardment. Each survives only a fraction of a second before decaying into flerovium. Sitting below polonium in the periodic table, livermorium is predicted to be a metal, but its chemistry remains unexplored.