Unbiquadium, also known as element 124 or eka-uranium, is the possible chemical element with atomic number 124 and placeholder symbol Ubq. "Unbiquadium" and "Ubq" are the temporary IUPAC name and symbol, respectively, until the element is discovered, confirmed, and a permanent name is decided upon. In the periodic table, unbiquadium is expected to be a g-block superactinide and the sixth element in the 8th period. Unbiquadium has attracted attention, as it may lie within the island of stability, leading to longer half-lives.