The Unbibium series is an obsolete theoretical group of elements in the Extended periodic table. It consists of 23 elements, starting at Unbibium and ending at Unquadtrium. See "Extended Periodic Table" in Wikipedia.
| Ubb | Ubt | Ubq | Ubp | Ubh | Ubs | Ubo | Ube | Utn | Utu | Utb | Utt | Utq | Utp | Uth | Uts | Uto | Ute | Uqn | Uqu | Uqb | Uqt | ||||||||||