Element Lutetium

Lutetium ElementsIt 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:Globally Harmonized System of Classification
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

IsotopeMass/DaNatural abundance (atom %)Nuclear spin (I)Magnetic moment (μ/μN)
175Lu174.940770 (3)97.41 (2)7/22.2327
176Lu175.942679 (3)2.59 (2)73.19

Radiosotope data

IsotopeMass/DaHalf-lifeMode of decayNuclear spinNuclear magnetic moment
169Lu168.937651.419 dEC to 169Yb7/2
170Lu169.938472.01 dEC to 170Yb0
171Lu170.9379108.24 dEC to 171Yb7/22.0
172Lu171.9390826.70 dEC to 172Yb42.25
173Lu172.9389271.37 yEC to 173Yb7/22.3
174Lu173.9403343.3 yEC to 174Yb11.9
177Lu176.9437556.75 dβ to 177Hf7/22.239

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