Element Lutetium
It is a silvery white metal, which resists corrosion in dry air, but not in moist air. Lutetium is the last element in the lanthanide series, and it is traditionally counted among the rare earths
Lutetium is a chemical element with the symbol Lu and atomic number 71.
Names and Identifiers
| Chemical Formula: | Lu |
| CAS: | 7439-94-3 |
| Molecular Weight: | 174.967 g/mol |
| EC Number : | 231-103-0 |
| MDL Number: | MFCD00011098 |
| Color: | silvery-white |
| Other Names: | Lutezio, Lutécio |
| PubChem CID: | 23929 |
| IUPAC Name: | Lutetium |
| Inchl: | InChI=1S/Lu |
| InChI Key: | OHSVLFRHMCKCQY-UHFFFAOYSA-N |
| Canonical SMILES: | [Lu] |
| ICSC Number: | n/a |
Physical & Chemical Properties
| Phase: | Solid |
| Density: | 9.841 g/cm³ |
| Boiling Point: | 3675 K (3402 °C, 6156 °F) |
| Melting Point: | 1925 K (1652 °C, 3006 °F) |
| Molecular Formula: | Lu |
| Flash Point: | n/a |
| Exact Mass: | 174.940796 |
| Symbol: |  |
| Signal Word: | Danger |
| Hazard Statements: | H228 |
| Precautionary Statements: | P210 |
| Hazard Codes: | F:Highlyflammable; |
| Risk Phrases: | R11 |
| Safety Phrases: | S16-S33-S36/37/39-S26 |
| RIDADR: | UN 3089 4.1/PG 2 |
| WGK Germany: | 3 |
| RTECS: | n/a |
| Packaging Group: | III |
| Hazard Class: | 3 |
Lutetium is generally considered to have two stable isotopes, although strictly speaking Lu-176 is not entirely stable with a half-life of 3.78 x 1010 years.
Lu-175 can be used as a yield tracer in the ICP-MS based determination of Pu in urine.
Lu-176 is used for the production of radioactive Lu-177 which is a very promising radio-immunotherapy isotope for the treatment of small, soft tumors.
Naturally occurring isotopes
| Isotope | Mass/Da | Natural abundance (atom %) | Nuclear spin (I) | Magnetic moment (μ/μN) |
|---|---|---|---|---|
| 175Lu | 174.940770 (3) | 97.41 (2) | 7/2 | 2.2327 |
| 176Lu | 175.942679 (3) | 2.59 (2) | 7 | 3.19 |
Radiosotope data
| Isotope | Mass/Da | Half-life | Mode of decay | Nuclear spin | Nuclear magnetic moment |
|---|---|---|---|---|---|
| 169Lu | 168.93765 | 1.419 d | EC to 169Yb | 7/2 | |
| 170Lu | 169.93847 | 2.01 d | EC to 170Yb | 0 | |
| 171Lu | 170.937910 | 8.24 d | EC to 171Yb | 7/2 | 2.0 |
| 172Lu | 171.939082 | 6.70 d | EC to 172Yb | 4 | 2.25 |
| 173Lu | 172.938927 | 1.37 y | EC to 173Yb | 7/2 | 2.3 |
| 174Lu | 173.940334 | 3.3 y | EC to 174Yb | 1 | 1.9 |
| 177Lu | 176.943755 | 6.75 d | β– to 177Hf | 7/2 | 2.239 |