Uranium - U

Symbol: U
Atomic Number: 92
Atomic Weight: 238.0289
Element Classification: Radioactive Rare Earth Element (Actinide Series)
Discovered By: Martin Klaproth
Discovery Date: 1789 (Germany)
Name Origin: Named for the planet Uranus.

Density (g/cc): 19.05
Melting Point (K): 1405.5
Boiling Point (K): 4018
Appearance: Silvery-white, dense, ductile and malleable, radioactive metal.
Atomic Radius (pm): 138
Atomic Volume (cc/mol): 12.5
Covalent Radius (pm): 142
Ionic Radius: 80 (+6e) 97 (+4e)
Specific Heat (@20C J/g mol): 0.115
Fusion Heat (kJ/mol): 12.6
Evaporation Heat (kJ/mol): 417
Thermal Conductivity (@25C W/m K):
Debye Temperature (K): n/a
Pauling Negativity Number: 1.38
First Ionizing Energy (kJ/mol): 686.4
Oxidation States: 6, 5, 4, 3
Electronic Configuration: [Rn] 5f3 6d1 7s2
Lattice Structure: Orthorhombic (ORC)
Lattice Constant (): 2.850
Lattice C/A Ratio: n/a

Mineral Hardness [no units]: 6.0
Brinell Hardness [/MN m-2]: 2400
Vickers Hardness [/MN m-2]: 1960

Note: Uranium is radioactive material, care is advised. Work should be carried out in glove boxes with proper ventilation or "hot cells" if critical radiation limit is surpassed. In any case, check radiation.

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