Ununium (Uuu)

Science / Periodic Table of Elements / Ununium (Uuu): Atomic number: 111, Atomic mass: 271.8 g.mol -1, Electronegativity acoording to Pauling: unknown, Density: unknown, Melting point: unknown, Boiling point: unknown, Vanderwaals radius: unknown, Ionic radius: unknown, Isotopes: unknown, Electronic shell: [ Rn] 7s1 5f14 6d10, Discovered: Hofmann, Sigurd 1994. From its position in the periodic table, in group 11 below gold, this element should have the physical properties of a noble metal and, were it long enough lived it should be possible to make compound of it although, like gold, it might be reluctant to form them. Its appearance is unknown, probably it is yellow or orange metallic (like gold).