Roentgenium - 16 years ago element 111 was discovered
On December 8, 1994 an international research team led by Professor Sigurd Hofmann deteced exactly 16 years ago, element 111 for the first time. At that time a total of three atoms of the new element could be observed in the experiment at the accelerator facility at GSI. In later experiments at GSI and the japanese accelerator facility RIKEN more atoms of element 111 were detected, which confirmed the discovery beyond doubt.
Roentgenium, 272 times heavier than hydrogen, was created through nuclear fusion by bombarding a bismuth film with nickel ions. The element decays after a split second and can only be detected with very sensitive methods of analysis.