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128 UbsunbioctiumUbe


Name, Symbol, Number unbioctium, Ubo, 128
Chemical series Superactinides
Group, Period, Block g8, 8, g
Appearance unknown - silvery or grey in color
Standard atomic weight [340]  g·mol−1
Electron configuration [Uuo] 5g8 8s2
Electrons per shell 2, 8, 18, 32, 40, 18, 8, 2
Physical properties
Phase presumably solid
Selected isotopes
Main article: Isotopes of unbioctium
iso NA half-life DM DE (MeV) DP

Unbioctium (pronounced /ˌʌnbiˈɒktiəm/) is the temporary name of an undiscovered element on the periodic table that has the temporary symbol Ubo and atomic number 128.



The name unbioctium is used as a placeholder, as in scientific articles about the search for element 128. Transuranic elements (those beyond uranium) are, except for microscopic quantities and except for plutonium, always artificially produced, and usually end up being named for a scientist or the location of a laboratory that does work in atomic physics (see systematic element name for more information).


The element unbioctium would likely have isotopes that have relatively long half life, possibly on the order of 105 years, as this element is very close to an island of stability. An estimated five isotopes have half lives of over a year while Ubo-340 is the most stable.


The physical properties of unbioctium have not yet been investigated, though this element is expected to be highly reactive and oxidize quickly. This element would presumably be a metal and solid. The color would probably be silvery white.

See also

  • Unbiseptium−Unbiennium
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Unbioctium". A list of authors is available in Wikipedia.
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