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138 UtsuntrioctiumUte


Name, Symbol, Number untrioctium, Uto, 138
Chemical series Superactinides
Group, Period, Block g18, 8, g
Appearance unknown
Standard atomic weight [366] u (supposition)  g·mol−1
Electron configuration [Uuo] 5g18 8s2
Electrons per shell 2, 8, 18, 32, 50, 18, 8, 2
Physical properties
Phase presumably solid
Selected isotopes
Main article: Isotopes of untrioctium
iso NA half-life DM DE (MeV) DP

Untrioctium (pronounced /ˌʌntraɪˈɒktiəm/) is an unsynthesized chemical element with atomic number 138 and symbol Uto.

The name untrioctium is a temporary IUPAC systematic element name.


The name untrioctium is used as a placeholder, as in scientific articles about the search for element 138. 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 is the first element with a filled type G electron shell, holding 18 electrons, in its ground state.

See also

This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Untrioctium". A list of authors is available in Wikipedia.
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