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Europium

Metalsolid
Symbol: Eu
Atomic number: 63
Atomic mass: 151.965
Group: Lanthanide
CAS-number: 7440-53-1

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Physical data

Electronic dataThermal dataSteric data
Shells: 2, 8, 18, 25, 8, 2
Orbitals: [Xe] 4f7 6s2
Electronegativity: --, 1.0
1. Ionization potential: 5.6704 eV
2. Ionization potential: 11.245 eV
3. Ionization potential: 24.926 eV
Oxidation states: 3, 2
Electrical conductivity: 0.0112 10^6
Melting point: 822 °C
Boiling point: 1527 °C
Specific heat: 0.18 J/gK
Heat of fusion: 9.210 kJ/mol
Heat of vaporization: 143.50 kJ/mol
Thermal conductivity: 0.139 W/cmK
Atomic radius: 2.56 Å
Ionic radius: 1.07 Å (+3)
Covalent radius: 1.85 Å
Atomic volume: 28.9 cm³/mol
Density (293 K): 5.259 g/cm³
Crystal structure: cubic body centered
cubic body centered

Isotopes

NuclideAbundance [%]MassSpinHalflifeDecay modeDecay tree
148Eu 0 148 5 54.5d EC, β+ View
149Eu 0 149 5/2 93.1d EC View
150Eu 0 150 5 36y EC View
151Eu 47.82 150.92 5/2 -- --
152Eu 0 152 3 13.48y EC, β+, β- View
152Eum 0 152 0 9.29h β-, EC, β+ View
153Eu 52.18 152.921 5/2 -- --
154Eu 0 154 3 8.59y β-, EC View
155Eu 0 155 5/2 4.71y β- View
156Eu 0 156 0 15.2d β- View

Other info

Name origin:Named for the continent of Europe.
Description:Soft, silvery-white metal.
Discovered by:Eugène Demarçay
Year:1901
Place:France
Sources:Obtained from monazite sand, which is a mixture of phosphates of calcium, thorium, cerium, and most other rare earths.
Use(s):Used with yttrium oxide to make red phosphors for color CRT televisions.