Berkeley Group Reports Discovery of Element 104

A Berkeley group says it has positively identified two isotopes of element 104, $X257104$ and $X259104.$ Speaking at the American Chemical Society's Mendeleev Centennial Symposium, Albert Ghiorso said that they also think they have found $X258104,$ but are not yet sure. The group was unable to observe $X260104,$ which Georgi N. Flerov and his collaborators at the Joint Institute for Nuclear Research, Dubna had reported in 1964 (and named kurchatovium).