Atomic Number 92     State solid     Color metallic grey

Atomic Mass of Naturally Occurring Radioactive Isotopes 238.0289

Density 19.05 g/mL     Electronegativity 1.36

Melting Point 1132°C     Boiling Point 3818°C

Natural Isotopes U-234 0.0055%   U-235 0.7200%   U-238 99.2745%

Abbreviated Electron Configuration [Rn] 5f³ 6d¹ 7s²

Discovered by Martin Klaproth in 1789.