Uranium

Uranium is a chemical element; it has symbol U and atomic number 92. It is a silvery-grey metal in the actinide series of the periodic table. A uranium atom... Wikipedia

• Name, symbol:  uranium, U
• Pronunciation:  -nee-əm]]
• Appearance:  silvery gray metallic, corrodes to a spalling black oxide coat in air
• Oxidation states:  6, 5, 4, 3, 2, 1 ​(a weakly basic oxide)
• Electronegativity:  Pauling scale: 1.38
• energies:  1st: 597.6 kJ/mol, 2nd: 1420 kJ/mol
• Atomic radius:  empirical: 156 pm
• Covalent radius:  196±7 pm
• Van der Waals radius:  186 pm
• Crystal structure:  ​orthorhombic
• Speed of sound thin rod:  3155 m/s (at 20 °C)
• Thermal expansion:  13.9 µm/(m·K) (at 25 °C)
• Thermal conductivity:  27.5 W/(m·K)
• Electrical resistivity:  0.280 µΩ·m (at 0 °C)
• Magnetic ordering:  paramagnetic
• Young's modulus:  208 GPa
• Shear modulus:  111 GPa
• Bulk modulus:  100 GPa
• Poisson ratio:  0.23
• Vickers hardness:  1960–2500 MPa
• Brinell hardness:  2350–3850 MPa
• CAS Number:  7440-61-1
• Naming:  after planet Uranus, itself named after Greek god of the sky Uranus
• Discovery:  Martin Heinrich Klaproth (1789)
• First isolation:  Eugène-Melchior Péligot (1841)
• Data source:  DuckDuckGo