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121 UbnunbiuniumUbb


Name, Symbol, Number unbiunium, Ubu, 121
Chemical series Superactinides
Group, Period, Block g1, 8, g
Appearance unknown
Standard atomic weight [320] u (supposition)  g·mol−1
Electron configuration [Uuo] 5g1 8s2
Electrons per shell 2, 8, 18, 32, 33, 18, 8, 2
Physical properties
Phase presumably solid
Selected isotopes
Main article: Isotopes of unbiunium
iso NA half-life DM DE (MeV) DP

Unbiunium (pronounced /ˌʌnbiˈjuːniəm/) is the temporary name of an undiscovered chemical element in the periodic table that has the temporary symbol Ubu and has the atomic number 121.

Unbiunium is the first element whose ground state electron configuration contains an electron in a g subshell, making it the first element in the g-block. Other elements have access to their g subshells, though not in their ground states.


The name unbiunium is used as a placeholder, as in scientific articles about the search for element 121. 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).

See also

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