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120 UueunbiniliumUbu


Name, Symbol, Number unbinilium, Ubn, 120
Chemical series Presumably Alkali earth metals
Group, Period, Block 2, 8, s
Appearance unknown, probably metallic
and silvery white or grey colour
Standard atomic weight predicted, (318)  g·mol−1
Electron configuration [Uuo] 8s2
(a guess based upon barium
and radium)
Electrons per shell 2, 8, 18, 32, 32, 18, 8, 2
Physical properties
Oxidation states presumably 2
Phase presumably solid
Selected isotopes
Main article: Isotopes of unbinilium
iso NA half-life DM DE (MeV) DP

Unbinilium (pronounced /ˌʌnbɪˈnɪliəm/), also called eka-radium, is the temporary name of an undiscovered chemical element in the periodic table that has the temporary symbol Ubn and has the atomic number 120.



The name unbinilium is used as a placeholder, as this element hasn't been officially named. Transuranic elements are, except for plutonium and microscopic quantities of others, always artificially produced.

See systematic element name.

Stable Unbinilium

The element is of interest because it is part of the hypothesized island of stability, with isotope 318 being the most stable of those that can be created by current methods. Using the spherical model of shell formation, element 120 would be the heaviest element in an island of stability, and also, along with 114, the most spherical. (Patra et al. Journal of Physics 2000)


Unbinilium would be highly reactive as this element is a member of Alkaline earth metals. It would be much more reactive than any other lighter elements of this group. This element would react violently in air to form unbinilium oxide and in water to form unbinilium hydroxide, which would be a strong base.

See also

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