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119 UuoununenniumUbn


Name, Symbol, Number ununennium, Uue, 119
Chemical series Presumably Alkali metals
Group, Period, Block 1, 8, s
Appearance unknown, probably colorless
Standard atomic weight predicted, (316)[1]  g·mol−1
Electron configuration [Uuo] 8s1[2]
(a guess based upon caesium
and francium)
Electrons per shell 2, 8, 18, 32, 32, 18, 8, 1
Physical properties
Phase solid predicted[2]
Selected isotopes
Main article: Isotopes of ununennium
iso NA half-life DM DE (MeV) DP

Ununennium (pronounced /ˌjuːnəˈnɛniəm/), or eka-francium, is the temporary name of an undiscovered chemical element in the periodic table that has the temporary symbol Uue and has the atomic number 119[2], with a predicted significant atomic mass of 316[1]. Like other alkali metals, it would most likely be extremely reactive with water.

Element 119 would be the first element in the eighth period of the periodic table.[2]


The name ununennium is used as a placeholder, as in scientific articles about the search for element 119. 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).


  1. ^ a b Theory of atomic-mass calculation Apsidium, 2006-11-26
  2. ^ a b c d Ununennium 119 Uue Apsidium, 2006-11-03

See also

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