Lutetium

Metal

Symbol: Lu
Atomic number: 71
Atomic mass: 174.967
Group: Transition Metal
CAS-number: 7439-94-3

Navigation
Y

Yb				Hf

Lr

Go to element

Electronic data

Shells: 2, 8, 18, 32, 9, 2
Orbitals: [Xe] 4f¹⁴ 5d¹ 6s²
Electronegativity: --, 1.1
1. Ionization potential: 5.4259 eV
2. Ionization potential: 13.888 eV
3. Ionization potential: 20.957 eV
Oxidation states: 3
Electrical conductivity: 0.0185 10^6

Thermal data

Melting point: 1663 °C
Boiling point: 3402 °C
Specific heat: 0.15 J/gK
Heat of fusion: 18.60 kJ/mol
Heat of vaporization: 355.90 kJ/mol
Thermal conductivity: 0.164 W/cmK

Steric data

Atomic radius: 2.25 Å
Ionic radius: 0.98 Å (+3)
Covalent radius: 1.56 Å
Atomic volume: 17.78 cm³/mol
Density (293 K): 9.85 g/cm³
Crystal structure: hexagonal

Nuclide	Abundance [%]	Mass	Spin	Halflife	Decay mode	Decay tree
¹⁷³Lu	0	173	7/2	1.37y	EC	View
¹⁷⁴Lu	0	174	1	3.3y	EC, β+	View
¹⁷⁴Lum	0	174	6	142d	IT, EC	View
¹⁷⁵Lu	97.41	174.941	7/2	--	--
¹⁷⁶Lu	2.59	175.943	7	3.6E10y	β-	View
¹⁷⁷Lu	0	177	7/2	6.68d	β-	View
¹⁷⁷Lum	0	177	23/2	160.7d	β-, IT	View

Name origin:	Named for the ancient name of Paris, Lutecia.
Description:	Silvery-white, hard, dense, rare earth metal.
Discovered by:	Georges Urbain
Year:	1907
Place:	France
Sources:	Found with ytterbium in gadolinite and xenotime. Usually obtained from monazite sand which is often 50% rare earth by mass and 0.003% lutetium.
Use(s):	It has no practical applications.

Lutetium

Physical data

Electronic data

Thermal data

Steric data

Isotopes

Other info