Unbiunium
| properties | |
|---|---|
| Properties (if known) | |
| Name , symbol , atomic number | Unbiunium, Ubu, 121 |
| Element category | Superactinoids |
| Group , period , block | 3 , 8 , g |
| CAS number | 54500-70-8 |
| Atomic | |
| Atomic mass | estimated 299 u |
| Electron configuration | [ Og ] 5 g 1 8 s 2 (?) |
| Electrons per energy level | 2, 8, 18, 32, 33, 18, 8, 2 |
| As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions . Values that are particularly questionable are marked with (?) | |
Unbiunium is a currently hypothetical chemical element with atomic number 121.
In the periodic table it is between the 120 unbinilium and the 122 unbibium .
In the extended periodic table (it is outside the "normal" periodic table ) it belongs to the superactinoids . The name is the temporary systematic IUPAC name and stands for the three digits of the ordinal number.
It may be the first element of the periodic table to have an occupied g orbital , which would fill the 5th shell with an additional electron . Since there are no natural isotopes , it would first have to be generated artificially through a nuclear reaction .
Target-projectile combinations for cores with Z = 121
The following table shows all combinations for targets and projectiles that could be used to generate nuclei with a charge number of 121, whose half-life does not already stand in the way (T 1/2 > 0.2 a).
All combinations are deficient by at least 3 neutrons.
| Target | projectile | product | ||||
|---|---|---|---|---|---|---|
| core | HWZ (a) | core | HWZ (a) | core | core | comment |
| 208 Pb | stable | 89 Y | stable | 297 Ubu | 297 Ubu | too neutron poor °) |
| 232 Th | 14 billion | 71 Ga | stable | 303 Ubu | 300 Ubu | too neutron poor °) |
| 238 U | 4.5 billion | 65 Cu | stable | 303 Ubu | 300 Ubu | too neutron poor °) |
| 237 Np | 2.1 million | 64 Ni | stable | 301 Ubu | 298 Ubu | too neutron poor °) |
| 244 Pu | 80 million | 59 Co | stable | 303 Ubu | 300 Ubu | too neutron poor °) |
| 244 Pu | 80 million | 60 Co | 5.2 | 304 Ubu | 301 Ubu | too low in neutrons °) combination richest in neutrons |
| 243 On | 7370 | 58 feet | stable | 301 Ubu | 298 Ubu | too neutron poor °) |
| 243 On | 7370 | 60 feet | 2.6 million | 303 Ubu | 300 Ubu | too neutron poor °) |
| 248 cm | 340000 | 55 mn | stable | 303 Ubu | 300 Ubu | too neutron poor °) |
| 250 cm | 9000 | 55 mn | stable | 305 Ubu | 302 Ubu | too neutron poor °) |
| 247 Bk | 1380 | 54 Cr | stable | 301 Ubu | 298 Ubu | too neutron poor °) |
| 248 Bk | 9 | 54 Cr | stable | 302 Ubu | 299 Ubu | too neutron poor °) |
| 249 Bk | 0.88 | 54 Cr | stable | 303 Ubu | 300 Ubu | too neutron poor °) |
| 249 Cf | 351 | 51 V | stable | 300 Ubu | 297 Ubu | too neutron poor °) |
| 250 cf | 13 | 51 V | stable | 301 Ubu | 298 Ubu | too neutron poor °) |
| 251 Cf | 900 | 51 V | stable | 302 Ubu | 299 Ubu | too neutron poor °) |
| 252 Cf | 2.6 | 51 V | stable | 303 Ubu | 300 Ubu | too neutron poor °) |
| 252 it | 1.3 | 50 Ti | stable | 302 Ubu | 299 Ubu | too neutron poor °) |
| 254 it | 0.75 | 50 Ti | stable | 304 Ubu | 301 Ubu | too low in neutrons °) combination richest in neutrons |
°) If one follows the trend of the last generated isotopes of 115 Moscovium and 117 Tenness, these nuclei contain far too few neutrons to have longer half-lives.
