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Unbiunium is a hypothetical (theoretical or imagined) element of the periodic table. It is also known as eka-actinium. The atomic number of this element is 121. It has the symbol Ubu. The name Unbiunium and the symbol Ubu are temporary IUPAC names. This name and symbol exist until a permanent name is decided. It is expected to be a F-block element and an superactinides. It is the third element in the eighth period of the periodic table.

The synthesis of unbiunium was first attempted in 1977 by bombarding a target of uranium-238 with copper-65 ions at the GSI Helmholtz Centre for Heavy Ion Research in Darmstadt, Germany:

  • 238U + 65Cu → 303Ubu

No atoms were identified.[1]

References[change | change source]

  1. Hofmann, Sigurd (2002). On Beyond Uranium. Taylor & Francis. p. 105. ISBN 978-0-415-28496-7.