Europium was named after the continent of Europe. However, most of the world's supply of the element comes from the USA and China, where pure europium is mined from the mineral bastnasite. Europium oxide, Eu2O3 is used in the ink of euro banknotes as a security measure to prevent counterfeiting. When placed under ultraviolet (UV) light, the compound emits a red glow.

Summary of properties (Eu)

Atomic weight151.964(1)
Discoverer (year)Demacay, Had (1901)
Natural formmetallic solid (body centered cubic)
Electron configuration[Xe] 47 6s2
Melting point (ºC)822
Boiling point (ºC)1597
Abundance in earth's crust (ppm)2.0
Isotope (abundance)151Eu (47.81), 153Eu (52.19)
Density g/cm35.24
Van der Waals radius (pm)235
Covalent radius (pm)183
Electronegativity (Pauling)
Vaporization enthalpy (kJ/mol)176.00
Enthalpy of fusion (kJ/mol)9.21
Specific heat capacity (J/g·K) at 25ºC and 1 atm0.18
Thermal conductivity (W/cm·K) at 25ºC and 1 atm0.140
Oxidation state+3, +2
Electron affinity (eV)0.86
1st Ionization potential (eV)5.6704

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