Untriennium
Encyclopedia : U : UN : UNT : Untriennium
|- ! colspan="2" style="background:#f4d2d8; color:#gray" | References |}
Untriennium (eka-actinium/dvi-lanthanum) is an unsynthesized chemical element with atomic number 139 and symbol Ute.
The name untriennium is a temporary IUPAC systematic element name.
History
The name untriennium is used as a placeholder for the element 139 until it is discovered. Transuranic elements beyond plutonium are always artificially produced, and usually end up being named for a scientist or the location of a laboratory that does work in atomic physics.Significance
In a relativistic approximation, the speed of an electron in a 1s electron orbital, v, is estimated to approach the speed of light for 1s orbitals in element 138. At element 139, it is predicted that these electrons will have a speed in excess of c and as such would not have stable electron orbitals.It is the first element with a filled type G electron shell, holding 18 electrons, and an electron and the overlaying type F orbital, in its ground state.
External links
- [Feynman Online] - describes why Ute may be the first of a new kind of chemical element.
- [Likely propeties of Untriennium]
- [Extended Periodic Table]
See also
- Lanthanum
- Dvi-Lanthanum — Dvi-Cerium
- Bohrium
- Eka-Seaborgium — Eka-Bohrium — Eka-Hassium
From Wikipedia, the Free Encyclopedia. Original article here. Support Wikipedia by contributing or donating.
All text is available under the terms of the GNU Free Documentation License See Wikipedia Copyrights for details.