Meanwhile, in Dubna, Russia, researchers have experiments under way to produce an isotope of element 110
with a mass of 273 by bombarding plutonium with sulfur.
It decayed after less than a millisecond by emitting an alpha particle, which consists of two protons and two neutrons, to create an iso tope of element 110
with an atomic mass of 273.
The discovery of element 111 caps a remarkable season for the Darmstadt lab, which in November found element 110
(SN: 11/26/94, p.
So far the heaviest element claimed by any researchers in the field is element 110
, which has been the object of experiments by a Dubna group led by Yuri Oganessian.
All elements heavier than uranium that have been found so far are subject to radioactive decay, but there is a strong hope that somewhere above element 110
there is a range of stable or relatively stable elements.