Symbol: Eu
Atomic Number: 63
Atomic Weight: 151.965
Element Classification: Rare Earth Element (Lanthanide Series)
Discovered By: Eugene-Antole Demarcay
Discovery Date: 1901 (France)
Name Origin: Named for the continent of Europe.

Density (g/cc): 5.243
Melting Point (K): 1095
Boiling Point (K): 1870
Appearance: Soft, silvery-white metal
Atomic Radius (pm): 199
Atomic Volume (cc/mol): 28.9
Covalent Radius (pm): 185
Ionic Radius: 95 (+3e) 109 (+2e)
Specific Heat (@20C J/g mol): 0.176
Fusion Heat (kJ/mol): n/a
Evaporation Heat (kJ/mol): 176
Thermal Conductivity (@25C W/m K):
Debye Temperature (K): n/a
Pauling Negativity Number: 0.0
First Ionizing Energy (kJ/mol): 546.9
Oxidation States: 3, 2
Electronic Configuration: [Xe] 4f7 6s2
Lattice Structure: Body-Centered Cubic (BCC)
Lattice Constant (): 4.610
Lattice C/A Ratio: n/a

Vickers Hardness [/MN m-2]: 167

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