Ununennium

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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]

History

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]

<math>\,^{254}_{99}\mathrm{Es} + \,^{48}_{20}\mathrm{Ca} \to \,^{302}_{119}\mathrm{Uue} ^{*} \to \

</math>  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.

Notes

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

Ununennium

History

Notes

See also

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