Periodic Table
Unbitrium, also known as eka-protactinium or more generally as element 123, is the hypothetical chemical element with the symbol Ubt and atomic number 123. Unbitrium and Ubt are respectively the temporary IUPAC name and symbol, which are used until the element is discovered, confirmed and a permanent name is decided upon. This 8th-period element would belong to the superactinid family, and would be part of the