Glenn Theodore Seaborg. 19 April 1912 — 25 February 1999

Darleane C. Hoffman


Glenn T. Seaborg was a world-renowned nuclear chemist, educator, scientific adviser to ten US presidents, humanitarian, and Nobel laureate in chemistry. He is probably best known for his leadership of the team that in 1941 accomplished the first chemical separation and positive identification of plutonium and for his ‘revolutionary’ actinide concept in which he placed the first 14 elements heavier than actinium in the periodic table of elements as a 5f transition series under the lanthanide 4f transition series. He went on to be co-discoverer of nine elements beyond plutonium, culminating in 1974 in the production of element 106, later named seaborgium in his honour.