Untriennium

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• Untriennium
• Ute

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139 Uto ← untriennium → Uqn Ac ↑ Ute ↓ Uoe periodic table - Extended Periodic Table
General
Name, Symbol, Number	untriennium, Ute, 139
Element category	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
Most-stable isotopes
Main article: Isotopes of untriennium iso NA half-life DM DE (MeV) DP
References

Untriennium (pronounced /ʌntraɪˈɛniəm/, 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.

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 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).

Significance

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.

External links

• Likely properties of Untriennium
• Extended Periodic Table
• Feynman Online

See also

• Lanthanum
• Dvi-Lanthanum — Dvi-Cerium
• Actinium
• Eka-Radium — Eka-Actinium — Eka-Thorium
• Eka-Seaborgium — Eka-Bohrium — Eka-Hassium
• Untrioctium