Lutetium

Atomic properties
Atomic number	71
Standard atomic weight	174.9668(1)
Electron configuration	[Xe] 4f14 5d1 6s2
Physical properties
Melting point	1652 °C (1925 K)
Boiling point	3327 °C (3600 K)
Density	9.84 g cm−3 (20 °C)
Electric resistivity	68 μΩ cm
Chemical properties
Electronegativity	1.27 (Pauling)
Solubility in water	reacts
Ionization energies
1st	5.425 85(2) eV; 523.51(2) kJ mol−1
2nd	13.90 eV; 1341 kJ mol−1
3rd	21.29 eV; 2054 kJ mol−1
Electron affinity
	0.340(10) eV; 32.8(10) kJ mol−1
Atomic radii
Covalent radius	187 pm
Metallic radius	173.8 pm
Ionic radius	100.1 pm (Lu3+, Oh)
Thermodynamic properties
Enthalpy change of vaporization	414 kJ mol−1
Miscellaneous
CAS number	7439-94-3
EC number	231-103-0
	Where appropriate, and unless otherwise stated, data are given for 100 kPa (1 bar) and 298.15 K (25 °C).
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ytterbium ← lutetium → hafnium

—
↑
Lu
↓
Lr

Lutetium (symbol: Lu) is a chemical element, one of the lanthanoids and also a rare earth element.

Notes and references

↑ ^1.0 ^1.1 ^1.2 ^1.3 Greenwood, Norman N.; Earnshaw, A. Chemistry of the Elements; Pergamon: Oxford, 1984; pp 1423–49. ISBN 0-08-022057-6.
↑ Allred, A. L. Electronegativity values from thermochemical data. J. Inorg. Nucl. Chem. 1961, 17 (3–4), 215–21. DOI: 10.1016/0022-1902(61)80142-5.
↑ Martin, W. C.; Zalubas, R.; Hagan, L. Atomic energy levels – the rare earth elements. Natl. Stand. Ref. Data Ser. (U.S., Natl. Bur. Stand.) 1978, 60, 1–411.
↑ Davis, V. T.; Thompson, J. S. Measurement of the electron affinity of lutetium. J. Phys. B: At., Mol. Opt. Phys. 2001, 34 (14), L433–37. DOI: 10.1088/0953-4075/34/14/102.
↑ Cordero, Beatriz; Gómez, Verónica; Platero-Prats, Ana E.; Revés, Marc; Echeverría, Jorge; Cremades, Eduard; Barragán, Flavia; Alvarez, Santiago Covalent radii revisited. Dalton Trans. 2008 (5), 2832–38. DOI: 10.1039/b801115j.
↑ Shannon, R. D. Revised effective ionic radii and systematic studies of interatomic distances in halids and chalcogenides. Acta Crystallogr. A 1976, 32 (5), 751–67. DOI: 10.1107/S0567739476001551.

See also the corresponding article on Wikipedia.

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