Unbiunium
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 | ||||||
Creation attempts
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".