106
Sg
Seaborgium
271
Seaborgium (Sg)
Transition MetalGroup 6Period 7d-block-blockRadioactive
Seaborgium is a synthetic element with symbol Sg and atomic number 106. Its most stable isotope 271Sg has a half-life of 1.9 minutes. A more recently discovered isotope 269Sg has a potentially slightly longer half-life (ca.
Latin name: Seaborgium
Atomic Number
106
Atomic Mass
271 g/mol
Phase (STP)
Solid (predicted)
Electron Config.
[Rn] 5f¹⁴ 6d⁴ 7s²
General
SymbolSg
Atomic Number106
Atomic Mass271 g/mol
CategoryTransition Metal
Group6
Period7
Blockd-block
Electron Configuration[Rn] 5f¹⁴ 6d⁴ 7s²
Valence Electrons6
Colourmetallic (predicted)
Physical Properties
Phase (STP)Solid (predicted)
Density35 (predicted)
Melting Point2830 (predicted)
Boiling Point6100 (predicted)
Atomic Properties
Atomic Radius243 pm
Electronegativity1.3 Pauling
Oxidation States+6
Ion ChargeSg6+
Nuclear & Hazards
RadioactiveYes
Half-life1.9 minutes (Sg-271)
Abundance
In Earth's Crust0%
Discovery & History
Discovery Year1974
Discovered ByLawrence Berkeley National Laboratory
Country of DiscoveryUSA
Isotopes of Seaborgium
| Isotope | Abundance | Half-life | Decay |
|---|---|---|---|
| Sg-269 | — | ~3.1 minutes | α |
| Sg-271 | — | ~2.4 minutes | α |