The g-elements in the periodic table of the elements are atoms whose electronic shell contains valence g-electrons with the highest energy.
| ↓ Period | ||||||||||||||||||
| eight | 121 Ubu | 122 Ubb | 123 Ubt | 124 Ubq | 125 Ubp | 126 Ubh | 127 Ubs | 128 Ubo | 129 Ube | 130 Utn | 131 Utu | 132 Utb | 133 Utt | 134 Utq | 135 Utp | 136 Utth | 137 Uts | 138 Uto |
| 9 | 171 Usu | 172 Usb | 173 Ust | 174 Usq | 175 Usp | 176 Ush | 177 Uss | 178 Soso | 179 Use | 180 Uon | 181 Uou | 182 Uob | 183 Uot | 184 Ouq | 185 Up | 186 Uoh | 187 Os | 188 Uoo |
None of the elements of the block has yet been synthesized, although attempts to synthesize unbibium have been undertaken. Very little is known about these superactinoids .
See also
- Electronic configuration