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Unbiunium | colspan="2" cellspacing="0" cellpadding="2" | {| align="center" border="0" | | colspan="2" align="center" | unbinilium - unbiniunium - unbibium | rowspan="3" valign="center" | Ac
Ubu
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| } | | colspan="2" align=center bgcolor="#f4f4c6" | Predicted properties | | Name, Symbol, Number | Unbiunium, Ubu, 121 | | Chemical series | Not classifiable | | Group, Period, Block | 3, 8, g | | Appearance | Unknown | | Atomic weight | 299 amu (supposition) | | Electron configuration | [Uuo] 5g1 8s2 | | e-s per energy level | 2, 8, 18, 32, 33, 18, 8, 2 | | State of matter | presumably a solid | Unbiunium (eka-actinium) 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. History The name unbinunium is used as a placeholder, such as in scientific articles about the search for element 121. Transuranic elements beyond plutonium are always artificially produced, and usually end up being named for a scientist or the location of a laboratory that does work in atomic physics. The element is of interest because it is the first element with a type G orbital, which may hold up to 18 electrons. See systematic element name. External links
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