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Template:Elementbox header2 Template:Elementbox series Template:Elementbox groupperiodblock Template:Elementbox appearance Template:Elementbox atomicmass gpm Template:Elementbox econfig Template:Elementbox epershell Template:Elementbox section physicalprop Template:Elementbox phase |- | Template:Elementbox section miscellaneous |- ! colspan="2" style="background:#ff6666; color:black" | Selected isotopes |- | colspan="2" |

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Ununennium (Template:PronEng), 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[1], with a predicted significant atomic mass of 316[2]. 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.[1]


The synthesis of element 119 was attempted in 1985 by bombarding a target of einsteinium-254 with calcium-48 ions at the superHILAC accelerator at Berkeley, California. No atoms were identified, leading to a limiting yield of 300 nb.[3]

no atoms

It is highly unlikely that this reaction will be useful given the extremely difficult task of making sufficient amounts of Es-254 to make a large enough target to increase the sensitivity of the experiment to the required level.


  1. 1.0 1.1 Ununennium 119 Uue Apsidium, 2006-11-03
  2. Theory of atomic-mass calculation Apsidium, 2006-11-26
  3. "Search for superheavy elements using 48Ca + 254Es reaction", Lougheed, R.W. et.al, Phys. Rev. C, 1985, 1760-1763

See also

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