Ununennium

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.

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

History

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).

Notes

See also

• ununoctium — unbinilium