Science / Periodic Table of Elements / Ununbium (Uub): Atomic number: 112, Atomic mass: 276.8 g.mol -1, Electronegativity: unknown, Density: unknown, Melting point: unknown, Boiling point: unknown, Vanderwaals radius: unknown, Ionic radius: unknown, Isotopes: 1, Discovered by: S. Hofmann, V. Ninov and F.P. Hessbuger in 1996. From its position in the periodic table, in group 12 below mercury, this element should have the physical properties of a heavy metal and, were it long-enough lived, it should be possible for it to have two kind of chemistry, corresponding to oxidation states M(I) and M(II), with the latter more unstable. Following periodic trends, it is expected to be a liquid metal more volatile that mercury. Applications: Ununbium does not have any known application and little is known about it. Ununbium in the environment: Ununbium is not found free i:n the environment, since it is a synthetic element. Health effects of ununbium As it is so unstable, any amount formed would decompose to other elements so quickly that there’s no reason to study its effects on human health. Environmental effects of ununbium: Due to its extremely short half-life (about 0.24 milliseconds), there’s no reason for considering the effects of ununbium in the environment.