Seaborgium

"Seaborgium (ⁱ/siːˈbɔrɡiəm/ see-bor-gee-əm) is a synthetic chemical element with the symbol Sg and atomic number 106."

"Seaborgium is a synthetic element whose most stable isotope ²⁷¹Sg has a half-life of 1.9 minutes. A new isotope ²⁶⁹Sg has a potentially slightly longer half-life (ca. 2.1 min) based on the observation of a single decay.^{[citation needed]} Chemistry experiments with seaborgium have firmly placed it in group 6 as a heavier homologue to tungsten."

"Element 106, now known as seaborgium, was first created in 1974 at the Super HILAC accelerator at the Lawrence Berkeley Laboratory by a joint Lawrence Berkeley/Lawrence Livermore collaboration led by Albert Ghiorso and E. Kenneth Hulet.^[2] They produced the new nuclide ²⁶³Sg by bombarding a target of ²⁴⁹Cf with ¹⁸O ions. This nuclide decays by α emission with a half-life of 0.9 ± 0.2 sec."

"Seaborgium is projected to be the third member of the 6d series of transition metals and the heaviest member of group 6 in the Periodic Table, belowchromium, molybdenum and tungsten. All the members of the group readily portray their group oxidation state of +6 and the state becomes more stable as the group is descended. Thus seaborgium is expected to form a stable +6 state. For this group, stable +5 and +4 states are well represented for the heavier members and the +3 state is known but reducing, except for chromium(III)."