CAS Number7440-73-5
PubChem CIDna
Atomic Radius260
Atomic Volume71.07
Atomic Weight[223]
Boiling Point677
Bulk Modulus
CategoryAlkali metals
Crystal Structure
Covalent Radius348
Electrical Resistivity
Electron Configuration[Rn] 7s1
Electrons per shell2, 8, 18, 32, 18, 8, 1
Heat of Fusion2
Heat of Vaporization65
Ionization Potential4.0727
Magnetic Ordering
Magnetic Susceptibility
Mass Number87
Melting Point23
Atomic Number223
Oxidation States1
Poisson Ratio
Shear Modulus
Specific Heat Capacity-
Thermal Conductivity0.15
Van der Waals radius
Young's Modulus
Abundance in Earth's crustna
Abundance in Universena
Fr Frantsiumu 87 (223) 1 7 s 87 27.0 677.0 [Rn] 7s1 2 8 18 32 18 8 1 N/A Silver Cubic: Body centered 0.7 {"1":"380"} 380 -44 1 2.7 2.1 64.0 15.0 1 21.7 m 31.7m BetaDecay Solid, AlkaliMetal, Metal, Radioactive, Natural FRAN-si-em Highly rare and unstable, radioactive metal. Since its isotopes have such short half-lives there are no commercially significant compounds of francium. Formed by decay of actinium. Chemical properties similar to cesium. Decays to radium or astatine. PyFLvSg6ZDw Francium
French chemist Georges Urbain successfully separated lutetium from ytterbia in 1907 in Paris.

Austrian scientist Carl Auer von Welsbach and American chemist Charles James also succeeded in isolating lutetium independently in the same year.

Pure lutetium metal was first produced in 1953. Lutetia is the ancient name for Paris 87 1939 Marguerite Perey France Named after "France"

Isotopes of Lutetium

Standard Atomic Weight


Stable Isotopes

Unstable Isotopes

199Fr 200Fr 201Fr 202Fr 203Fr 204Fr 205Fr 206Fr 207Fr 208Fr 209Fr 210Fr 211Fr 212Fr 213Fr 214Fr 215Fr 216Fr 217Fr 218Fr 219Fr 220Fr 221Fr 222Fr 223Fr 224Fr 225Fr 226Fr 227Fr 228Fr 229Fr 230Fr 231Fr 232Fr

Lutetium is considered to be non toxic
Lutetium was the last natural rare earth element to be discovered
Lutetium oxide is used to make catalysts for cracking hydrocarbons in the petrochemical industry.

Lutetium aluminum garnet has been proposed for use as a lens material in high refractive index immersion lithography.

Lutetium is used as a phosphor in LED light bulbs.