Element Europium

Europium ElementAn element of the rare earth family of metals. It has the atomic symbol Eu, atomic number 63, and atomic weight 152. Europium is used in the form of its salts as coatings for cathode ray tubes and in the form of its organic derivatives as shift reagents in NMR spectroscopy.
Europium atom is a lanthanoid atom and a f-block element atom.

Names and Identifiers

Chemical Formula:Eu
CAS:7440-53-1
Molecular Weight:151.964g/mol
EC Number :231-161-7
MDL Number:MFCD00010992
Color:silvery-white
Other Names:Europio
PubChem CID:23981
IUPAC Name:Europium
Inchl:InChI=1S/Eu
InChI Key:OGPBJKLSAFTDLK-UHFFFAOYSA-N
Canonical SMILES:[Eu]
ICSC Number:n/a

Physical & Chemical Properties

Phase:Solid
Density:5.264g/cm³
Boiling Point:1802 K ​(1529 °C, ​2784 °F)
Melting Point:1099 K ​(826 °C, ​1519 °F)
Molecular Formula:Eu
Flash Point:n/a
Exact Mass:152.921204
Symbol:Globally Harmonized System of Classification
Signal Word:Danger
Hazard Statements:H250
Precautionary Statements:P222-P231-P422
Hazard Codes:Xi:Irritant;
Risk Phrases:14/15-17-34
Safety Phrases:S43-S7/8-S45-S36/37/39-S27-S26-S23
RIDADR:UN 2813 4.3/PG 2
WGK Germany:3
RTECS:n/a
Packaging Group:II
Hazard Class:4.1

Europium has two stable isotopes and both are used for the production of radioisotopes.
Eu-151 is used for the production of Eu-152 which is used as a reference source in gammaspectroscopy.
Eu-153 can be used for the production of high specific activity Sm-153 via fast neutron irradiation.

Naturally occurring isotopes

IsotopeMass/DaNatural abundance (atom %)Nuclear spin (I)Magnetic moment (μ/μN)
151Eu150.919702 (8)47.81 (3)5/23.4718
153Eu152.921225 (4)52.19 (3)5/21.5331

Radiosotope data

IsotopeMass/DaHalf-lifeMode of decayNuclear spinNuclear magnetic moment
145Eu144.9162635.93 dEC to 145Sm5/23.99
146Eu145.917204.57 dEC to 146Sm41.43
147Eu146.91674224.4 dEC to 147Sm; α to 143Pm5/23.72
148Eu147.9181554.5 dEC to 148Sm; α to 143Pm52.34
149Eu148.9179293.1 dEC to 149Sm5/23.57
150Eu149.9197036 yEC to 150Sm52.71
152Eu151.92174113.5 yEC to 152Sm; β to 152Gd3-1.91
154Eu153.9229768.59 yEC to 154Sm; β to 154Gd32.000
155Eu154.9228904.76 yβ to 155Gd5/21.6
156Eu155.9247515.2 dβ to 156Gd3-2.01

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