Seaborgium (Sg)
“The first element in history named after a living scientist — Glenn Seaborg saw his own name enter the periodic table in 1997.”
How its electrons are arranged
Computed from the aufbau principle, with known real-world exceptions applied automatically.
The notes
Characteristics
- A synthetic Group 6 transition metal — the superheavy twin of molybdenum and tungsten — produced a few atoms at a time.
- Its longest-lived isotopes, such as Sg-269, persist for minutes at best; the original 1974 atoms survived under a second.
- Its chemistry has genuinely been studied: gas-phase work found volatile SgO₂Cl₂ like tungsten’s WO₂Cl₂, and solution experiments confirmed tungsten-like behaviour.
- Relativity matters here: slowed 7s electrons pull inward, so seaborgium’s bonding drifts subtly away from tungsten’s.
Seaborgium exists only as isolated radioactive atoms that fade away within minutes. Theory says it should be a dense, silvery Group 6 metal of the tungsten family, with relativistic effects nudging its properties away from a simple “heavier tungsten” picture.
Where you meet it
✦ Uses
- Testing Group 6 chemistry at the relativistic limit — comparing seaborgium with molybdenum and tungsten, atom by atom.
- Seaborgium hexacarbonyl, Sg(CO)₆, made in 2014, carried organometallic chemistry to the edge of the periodic table for the first time.
- Its isotopes’ decay chains feed nuclear-mass mapping in the region approaching the predicted island of stability.
◍ Everyday examples
- Photographs of an elderly Glenn Seaborg pointing to “his” element on the periodic table are favourites in chemistry classrooms worldwide.
- The 1951 Nobel Prize in Chemistry for the transuranium elements links this element’s namesake to every Nobel-season news feature.
- Science olympiad and quiz competitions often ask which element was the first named after a living scientist — the answer sits in Period 7, Group 6.
History & name
In 1974 a Berkeley team including Albert Ghiorso and Glenn Seaborg bombarded californium-249 with oxygen-18 ions and identified Sg-263, whose atoms lasted less than a second. A rival Soviet claim from Dubna could not be confirmed, and credit went to Berkeley. The name seaborgium — honouring the living Nobel laureate who co-discovered ten elements — annoyed traditionalists so much that IUPAC delayed approval until 1997. Seaborg remarked that having an element named after him meant even more to him than his 1951 Nobel Prize.