Template:Infobox uranium

protactinium ← uranium → neptunium Nd ↑ U ↓ (Uqb) 92U Periodic table
Appearance
silvery gray metallic; corrodes to a spalling black oxide coat in air
General properties
Name, symbol, number	uranium, U, 92
Pronunciation	/jʊˈreɪniəm/ yoo-RAY-nee-əm
Element category	actinide
Group, period, block	n/a, 7, f
Standard atomic weight	238.02891(3)
Electron configuration	[Rn] 5f3 6d1 7s2
Electrons per shell	2, 8, 18, 32, 21, 9, 2 (Image)
Physical properties
Phase	solid
Density (near r.t.)	19.1 g·cm−3
Liquid density at m.p.	17.3 g·cm−3
Melting point	1405.3 K, 1132.2 °C, 2070 °F
Boiling point	4404 K, 4131 °C, 7468 °F
Heat of fusion	9.14 kJ·mol−1
Heat of vaporization	417.1 kJ·mol−1
Molar heat capacity	27.665 J·mol−1·K−1
Vapor pressure
P (Pa) 1 10 100 1 k 10 k 100 k at T (K) 2325 2564 2859 3234 3727 4402
Atomic properties
Oxidation states	6, 5, 4, 3 (weakly basic oxide)
Electronegativity	1.38 (Pauling scale)
Ionization energies	1st: 597.6 kJ·mol−1
	2nd: 1420 kJ·mol−1
Atomic radius	156 pm
Covalent radius	196±7 pm
Van der Waals radius	186 pm
Miscellanea
Crystal structure	orthorhombic
Magnetic ordering	paramagnetic
Electrical resistivity	(0 °C) 0.280 µΩ·m
Thermal conductivity	27.5 W·m−1·K−1
Thermal expansion	(25 °C) 13.9 µm·m−1·K−1
Speed of sound (thin rod)	(20 °C) 3155 m·s−1
Young's modulus	208 GPa
Shear modulus	111 GPa
Bulk modulus	100 GPa
Poisson ratio	0.23
CAS registry number	7440-61-1
Most stable isotopes
Main article: Isotopes of uranium
iso NA half-life DM DE (MeV) DP 232U syn 68.9 y SF — α 5.414 228Th 233U syn 159,200 y SF 197.93 — α 4.909 229Th 234U 0.0054% 245,500 y SF 197.78 — α 4.859 230Th 235U 0.7204% 7.038×108 y SF 202.48 — α 4.679 231Th 236U trace 2.342×107 y SF 201.82 — α 4.572 232Th 238U 99.2742% 4.468×109 y α 4.270 234Th SF 205.87 — ββ

References

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