Seaborgium (Sg)
Transition metal · d-block · period 7 · group 6
A few atoms; predicted very dense metal.
Seaborgium (symbol Sg) is chemical element number 106, a transition metal in group 6, period 7 of the periodic table. Its standard atomic weight is (269) and its electron configuration is [Rn] 5f14 6d4 7s2. Its state at room temperature is unknown, and it is radioactive. Named after Glenn Seaborg while he was still alive — highly unusual.
Properties
| Atomic number | 106 |
|---|---|
| Atomic mass | (269) |
| Category | Transition metal |
| Block | d-block |
| Group · Period | 6 · 7 |
| Electron configuration | [Rn] 5f14 6d4 7s2 |
| Electrons per shell | 2, 8, 18, 32, 32, 12, 2 |
| State at 25 °C | unknown |
| Melting point | — |
| Boiling point | — |
| Density | — |
| Electronegativity (Pauling) | — |
| Radioactive | Yes — no stable isotope |
| Origin | synthetic |
| Discovered | 1974 · Berkeley |
Key facts about Seaborgium
- Named after Glenn Seaborg while he was still alive — highly unusual.
- Seaborg reshaped the periodic table by placing the actinides in their own row.
- Its chemistry resembles tungsten and molybdenum.
- Even its longest-lived form lasts only minutes.
What Seaborgium is used for
None — research only.
Where it sits in the periodic table
Seaborgium is in group 6, period 7, of the d-block. Its electron configuration [Rn] 5f14 6d4 7s2 means its outermost shell holds 2 electrons, which is what places it here and explains much of its chemistry. See Seaborgium on the interactive table →
Seaborgium — frequently asked questions
What is Seaborgium used for?
None — research only.
Is Seaborgium radioactive?
Yes. Seaborgium has no stable isotope, so every form of it is radioactive.
What is the electron configuration of Seaborgium?
Seaborgium has the electron configuration [Rn] 5f14 6d4 7s2, which is 2, 8, 18, 32, 32, 12, 2 electrons per shell.
What group and period is Seaborgium in?
Seaborgium is in group 6, period 7, in the d-block. Its outer shell holds 2 electrons.
Who discovered Seaborgium?
Seaborgium was discovered in 1974 by Berkeley.