Unhexoctium (), also known as eka-flerovium, dvi-lead, or element 168, is the possible chemical element in the periodic table that has the temporary symbol Uho and has the atomic number 168. Due to instabilities, it is not known if this element is physically possible, but if possible, unhexoctium is predicted to be the last period 8 element in group 14. It should have an atomic mass around 490. 