Isotopes of Ununseptium

Isotopes Of Ununseptium

Ununseptium (Uus) is the most-recently synthesized artificial element, and much of the data is hypothetical. As any artificial element, a standard atomic mass cannot be given. Like all artificial elements, it has no stable isotopes. The first (and so far only) isotopes to be synthesized were 293Uus and 294Uus in 2009. The longer-lived isotope is 294Uus with a half-life of 78 ms.