It is named after the American nuclear chemist Glenn T. Seaborg. As a synthetic element, it can be created in a laboratory but is not found in nature.
Seaborgium is a synthetic chemical element with the symbol Sg and atomic number 106.
Seaborgium is expected to be a solid under normal conditions and assume a body-centered cubic crystal structure, similar to its lighter congener tungsten.
It should be a very heavy metal with a density of around 35.0 g/cm3, which would be the fourth-highest of any of the 118 known elements.
This results from seaborgium’s high atomic weight, the lanthanide and actinide contractions, and relativistic effects, although production of enough seaborgium to measure this quantity would be impractical, and the sample would quickly decay.
Names and Identifiers
|Molecular Weight:||271.134 g/mol|
|EC Number :||n/a|
|Color:||unknown (presumably metallic/ silvery white/ gray)|
Physical & Chemical Properties
Seaborgium (106Sg) is a synthetic element, and thus a standard atomic weight cannot be given. Like all synthetic elements, it has no stable isotopes. The first isotope to be synthesized was 263mSg in 1974.
|Isotope||Mass/Da||Half-life||Mode of decay||Nuclear spin||Nuclear magnetic moment|
|258Sg||258.1132||0.0029||α to 254Rf; SF|
|259Sg||259.1147||0.9 s||α to 255Rf||1/2|
|260Sg||260.1144||0.0036 s||α to 256Rf||0|
|261Sg||261.1162||0.23 s||α to 257Rf; SF|
|263Sg||263.11822 (13)||0.8 s||α to 259Rf|
|265Sg||265.1211||16 s||α to 261Rf|
|266Sg||266.1219||21 s||α to 262Rf; SF|