Untriennium

From Wikipedia, the free encyclopedia

You have new messages (last change).
139 Uto ← untriennium → Uqn
Ac
↑
Ute
↓
Uoe
General
Name, Symbol, Number untriennium, Ute, 139
Chemical series Superactinides
Group, Period, Block 3, 8, f
Appearance  ?
Standard atomic weight [370] amu (supposition)  g·mol−1
Electron configuration [Uuo] 5g18 6f1 8s2
Electrons per shell 2, 8, 18, 32, 50, 19, 8, 2
Physical properties
Phase presumably solid
Miscellaneous
Selected isotopes
Main article: Isotopes of untriennium
iso NA half-life DM DE (MeV) DP
References

Untriennium (IPA: /ʌntrʌɪˈɛniəm/, also called eka-actinium or dvi-lanthanum) is an unsynthesized chemical element with atomic number 139 and symbol Ute.

The name untriennium is a temporary IUPAC systematic element name.

Contents

[edit] History

The name untriennium is used as a placeholder, as in scientific articles about the search for element 139. Transuranic elements (those beyond uranium) are, except for microscopic quantities, 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).

[edit] Significance

In a non-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 in the overlaying type F orbital, in its ground state.

[edit] External links

[edit] See also

  • Bohrium
  • Eka-Seaborgium — Eka-Bohrium — Eka-Hassium
Retrieved from "http://en.wikipedia.org../../../u/n/t/Untriennium.html"
In other languages