Cerium

Symbol: Ce
Atomic Number: 58
Atomic Weight: 140.115
Element Classification: Rare Earth Element (Lanthanide Series)
Discovered By: W. von Hisinger, J. Berzelius, M. Klaproth
Discovery Date: 1803 (Sweden/Germany)
Name Origin: Named after the asteroid, Ceres, discovered two years before the element.

Density (g/cc): 6.757
Melting Point (K): 1072
Boiling Point (K): 3699
Appearance: Malleable, ductile, iron-gray metal
Atomic Radius (pm): 181
Atomic Volume (cc/mol): 21.0
Covalent Radius (pm): 165
Ionic Radius: 92 (+4e) 103.4 (+3e)
Specific Heat (@20C J/g mol): 0.205
Fusion Heat (kJ/mol): 5.2
Evaporation Heat (kJ/mol): 398
Thermal Conductivity (@25C W/m K):
Debye Temperature (K): n/a
Pauling Negativity Number: 1.12
First Ionizing Energy (kJ/mol): 540.1
Oxidation States: 4, 3
Electronic Configuration: [Xe] 4f1 5d1 6s2
Lattice Structure: Face-Centered Cubic (FCC)
Lattice Constant (): 5.160
Lattice C/A Ratio: n/a

Mineral Hardness [no units]: 2.5
Brinell Hardness [/MN m-2]: 412
Vickers Hardness [/MN m-2]: 270

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