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Uranium


7
92
238.0289
KEY
Chemical Element Symbol Key

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Uranium
Columbia Encyclopedia
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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 (@20°C J/g mol): 0.115
Fusion Heat (kJ/mol): 12.6
Evaporation Heat (kJ/mol): 417
Thermal Conductivity (@25°C 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 (Å): 2.850
Lattice C/A Ratio: n/a


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