106[269]SgSeaborgium
Seaborgium (Sg) — element 106transition metal · group 6, period 7
Seaborgium is a chemical element with the symbol Sg and atomic number 106. It is a transition metal in group 6, period 7 of the periodic table (the d-block), with a standard atomic mass of [269] u. At room temperature (25 °C) seaborgium is predicted to be of unknown state.
💡 Known for: Named after Glenn T. Seaborg — the first element named after a living person.
# Seaborgium properties
| Symbol | Sg |
|---|---|
| Atomic number | 106 |
| Atomic mass | [269] u |
| Category | transition metal |
| Group | 6 |
| Period | 7 |
| Block | d-block |
| Electron configuration | [Rn] 5f¹⁴ 6d⁴ 7s² |
| Full configuration | 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f¹⁴ 5s² 5p⁶ 5d¹⁰ 5f¹⁴ 6s² 6p⁶ 6d⁴ 7s² |
| Electrons per shell | 2, 8, 18, 32, 32, 12, 2 |
| Protons / electrons | 106 / 106 |
| State at 25 °C | unknown |
| Melting point | unknown |
| Boiling point | unknown |
| Density | 35 g/cm³ (predicted) |
| Electronegativity (Pauling) | — |
| First ionization energy | — |
| Atomic radius | — |
| Discovered | 1974 |
Values for superheavy elements are theoretical predictions; none have been measured in bulk.
# Electron configuration of seaborgium
The electron configuration of seaborgium is [Rn] 5f¹⁴ 6d⁴ 7s², written out in full as 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f¹⁴ 5s² 5p⁶ 5d¹⁰ 5f¹⁴ 6s² 6p⁶ 6d⁴ 7s². Its 106 electrons fill 7 shells as 2, 8, 18, 32, 32, 12, 2, so the outermost shell holds 2 electrons. Because only a few atoms have ever been made, this configuration is a theoretical prediction.
# Related elements
DbDubniumprevious elementBhBohriumnext elementCrChromiumgroup 6MoMolybdenumgroup 6WTungstengroup 6ScScandiumtransition metalTiTitaniumtransition metalVVanadiumtransition metalMnManganesetransition metalFeIrontransition metalCoCobalttransition metalNiNickeltransition metalCuCoppertransition metal
# Seaborgium FAQ
What is the atomic number of seaborgium?
The atomic number of seaborgium is 106: every seaborgium atom has 106 protons in its nucleus. Its symbol is Sg.
What is the atomic mass of seaborgium?
The standard atomic mass of seaborgium is [269] u (the mass number of its longest-lived isotope, since it has no stable isotopes).
What is the electron configuration of seaborgium?
Seaborgium's electron configuration is [Rn] 5f¹⁴ 6d⁴ 7s² (1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f¹⁴ 5s² 5p⁶ 5d¹⁰ 5f¹⁴ 6s² 6p⁶ 6d⁴ 7s²), with 2, 8, 18, 32, 32, 12, 2 electrons per shell.
Is seaborgium a metal?
Yes. Seaborgium is a transition metal, one of the metals.
What is the melting point of seaborgium?
The melting point of seaborgium is not known. These values are predictions.
What is seaborgium used for / known for?
Named after Glenn T. Seaborg — the first element named after a living person.