Uranium

Atomic properties
Atomic number	92
Standard atomic weight	238.028 91(3)
Electron configuration	[Rn] 5f3 6d1 7s2
Physical properties
Melting point	1130 °C (1400 K)
Boiling point	3930 °C (4200 K)
Density	19.05 g cm−3
Electric resistivity	30.8 × 10−6 Ω cm
Chemical properties
Electronegativity	1.38 (Pauling)
Atomic radii
Covalent radius	196 pm
Metallic radius	156 pm
Ionic radius	87 pm (U6+, Oh); 103 pm (U4+, Oh)
Thermodynamic properties
Standard entropy	50.20(20) J K−1 mol−1
Enthalpy change of atomization	482 kJ mol−1
Enthalpy change of fusion	12.6 kJ mol−1
Enthalpy change of vaporization	417 kJ mol−1
Hazards
GHS pictograms
GHS signal word	DANGER
GHS hazard statements	H330, H300, H373, H413
Miscellaneous
CAS number	7440-61-1
EC number	231-170-6
	Where appropriate, and unless otherwise stated, data are given for 100 kPa (1 bar) and 298.15 K (25 °C).
	This box: view • talk

protactinium ← uranium → neptunium

Nd
↑
U
↓
—

Uranium (symbol: U) is a member of the actinoid series of chemical elements.

Notes and references

↑ ^1.0 ^1.1 ^1.2 Greenwood, Norman N.; Earnshaw, A. Chemistry of the Elements; Pergamon: Oxford, 1984; pp 1450–86. 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.
↑ 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.
↑ Index no. 092-001-00-8 of Annex VI, Part 3, to Regulation (EC) No 1272/2008 of the European Parliament and of the Council of 16 December 2008 on classification, labelling and packaging of substances and mixtures, amending and repealing Directives 67/548/EEC and 1999/45/EC, and amending Regulation (EC) No 1907/2006. OJEU L353, 31.12.2008, pp 1–1355 at p 446.

See also the corresponding article on Wikipedia.

Error creating thumbnail: Unable to save thumbnail to destination

This page is currently licensed under the Creative Commons Attribution 3.0 Unported license and any later versions of that license.