Element Europium
An 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: |  |
| 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
| Isotope | Mass/Da | Natural abundance (atom %) | Nuclear spin (I) | Magnetic moment (μ/μN) |
|---|---|---|---|---|
| 151Eu | 150.919702 (8) | 47.81 (3) | 5/2 | 3.4718 |
| 153Eu | 152.921225 (4) | 52.19 (3) | 5/2 | 1.5331 |
Radiosotope data
| Isotope | Mass/Da | Half-life | Mode of decay | Nuclear spin | Nuclear magnetic moment |
|---|---|---|---|---|---|
| 145Eu | 144.916263 | 5.93 d | EC to 145Sm | 5/2 | 3.99 |
| 146Eu | 145.91720 | 4.57 d | EC to 146Sm | 4 | 1.43 |
| 147Eu | 146.916742 | 24.4 d | EC to 147Sm; α to 143Pm | 5/2 | 3.72 |
| 148Eu | 147.91815 | 54.5 d | EC to 148Sm; α to 143Pm | 5 | 2.34 |
| 149Eu | 148.91792 | 93.1 d | EC to 149Sm | 5/2 | 3.57 |
| 150Eu | 149.91970 | 36 y | EC to 150Sm | 5 | 2.71 |
| 152Eu | 151.921741 | 13.5 y | EC to 152Sm; β– to 152Gd | 3 | -1.91 |
| 154Eu | 153.922976 | 8.59 y | EC to 154Sm; β– to 154Gd | 3 | 2.000 |
| 155Eu | 154.922890 | 4.76 y | β– to 155Gd | 5/2 | 1.6 |
| 156Eu | 155.92475 | 15.2 d | β– to 156Gd | 3 | -2.01 |