Glenn T. Seaborg

Seaborgium is a synthetic chemical element; it has symbol Sg and atomic number 106. It is named after the American nuclear chemist Glenn T. Seaborg. As a synthetic element, it can be created in a laboratory but is not found in nature. It is also radioactive; the most stable known isotopes have half-lives on the order of several minutes.

American chemist (1912–1999)

Proposal of a a a second inner transition series in the periodic table