Unbiunium is a hypothetical (theoretical or imagined) element of the periodic table. It is also known as eka-actinium. Its atomic number should be 121 and it has the symbol Ubu. The name Unbiunium and the symbol Ubu are temporary IUPAC names (meaning "one-two-one" in Latin). This name and symbol exist until a permanent name is decided and the element is created. It is expected to be a F-block element and in a group call the superactinides. It is the third element in the eighth period of the periodic table.
Unbiunium | ||||||
---|---|---|---|---|---|---|
Pronunciation | /ˌuːnbaɪˈuːniəm/ | |||||
Alternative names | element 121, eka-actinium | |||||
Unbiunium in the periodic table | ||||||
| ||||||
Group | g-block groups (no number) | |||||
Period | period 8 (theoretical, extended table) | |||||
Block | g-block | |||||
Electron configuration | [Og] 8s2 8p1 (predicted)[1] | |||||
Electrons per shell | 2, 8, 18, 32, 32, 18, 8, 3 (predicted) | |||||
Physical properties | ||||||
Phase at STP | solid (predicted) | |||||
Melting point | 950.15 K (677 °C, °F) | |||||
Boiling point | 1985.15 K (1714 °C, °F) | |||||
Atomic properties | ||||||
Oxidation states | (+1), (+3) (predicted)[1][2] | |||||
Ionization energies |
| |||||
Other properties | ||||||
CAS Number | 54500-70-8 | |||||
History | ||||||
Naming | IUPAC systematic element name | |||||
Isotopes of unbiunium | ||||||
Template:infobox unbiunium isotopes does not exist | ||||||
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.[3]
Another alternative name is "Lavoisium".
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