|Atomic mass||(263) amu|
Seaborgium is element 106. In 1974, the Soviets at the Joint Institute for Nuclear Research announced their discovery of element-106. Three months later, the American group at the Lawrence Berkeley Laboratory claimed positive discovery of the same element. The American claim is base on the bombardment of 249Cf with ions of 18O.
In 1994, the American research group that created element-106 has proposed that it be named seaborgium, in honour of the discover and Nobel Laureate Glenn T. Seaborg, codiscover of plutonium and nine other transuranium elements. The name was announced at the American Chemical Society meeting by E. Kenneth Hulet, a retired chemistry from the Lawrence Berkeley Laboratory and one of the codiscoverers of element-106. Until now, elements have not been named after living scientists.
It was Seaborg who proposed that thorium was the beginning of the actinide series and that the transuranium elements belonged as a group under the rare earths. When Seaborg offered his version of the periodic table, scientists, many of them Seaborg's friends, tried to discourage his publication of this proposal in the open literature for fear that he would ruin his scientific reputation.
Seaborg was strongly convinced and persisted. As a result, with Seaborg's expansion of the periodic table, it was possible to predict the properties of many of the yet-to-be-discovered transuranium elements. Subsequent discoveries of these elements proved him to be correct, and he was awarded the Nobel Prize in 1951 for his work.
Seaborg's many involvements in education matters include his chairing of the CHEM Study project beginnning in 1959, and his role as chairman of the Lawrence Hall of Science. He served also on the National Commission on Excellence in Education and received the George C. Pimentel Award in Chemical Education. Currently, Seaborg is the associate director-at-large of Lawrence Berkeley Laboratory.
Seen in the photo is Glenn Seaborg in a recent (March 1997) American Chemical Society meeting in San Francisco. He poses to show off seaborgium T-shirt with phrase, "I am in my element".