Uranium

Metal

Symbol: U
Atomic number: 92
Atomic mass: 238.0289
Group: Actinide
CAS-number: 7440-61-1

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Pa				Np

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Physical data

Electronic data

Shells: 2, 8, 18, 32, 21, 9, 2
Orbitals: [Rn] 5f³ 6d¹ 7s²
Electronegativity: --, 1.2
1. Ionization potential: 6.1941 eV
2. Ionization potential: -- eV
3. Ionization potential: -- eV
Oxidation states: 6, 5, 4, 3
Electrical conductivity: 0.0380 10^6

Thermal data

Melting point: 1132 °C
Boiling point: 3818 °C
Specific heat: 0.12 J/gK
Heat of fusion: 8.520 kJ/mol
Heat of vaporization: 477.0 kJ/mol
Thermal conductivity: 0.276 W/cmK

Steric data

Atomic radius: -- Å
Ionic radius: 0.81 Å (+6)
Covalent radius: 1.42 Å
Atomic volume: 12.59 cm³/mol
Density (293 K): 18.9 g/cm³
Crystal structure: orthorhombic

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Isotopes

Nuclide	Abundance [%]	Mass	Spin	Halflife	Decay mode	Decay tree
²³⁰U	0	230	0	20.8d	α	View
²³¹U	0	231	5/2	4.20d	EC	View
²³²U	0	232.037	0	70y	α, SF	View
²³³U	0	233.04	5/2	1.59E05y	α, SF	View
²³⁴U	0.0055	234.041	0	2.47E05y	α, SF	View
²³⁵U	0.72	235.044	7/2	7.04E08y	α, SF	View
²³⁶U	0	236.046	0	2.34E07y	α, SF	View
²³⁷U	0	237	1/2	6.75d	β-	View
²³⁸U	99.27	238.051	0	4.47E09y	α, SF	View
²³⁹U	0	239	5/2	23.5m	β-	View
²⁴⁰U	0	240	0	14.1h	β-	View

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Other info

Name origin:	Named for the planet Uranus.
Description:	Silvery-white, dense, ductile, malleable, radioactive metal.
Discovered by:	Martin Klaproth
Year:	1789
Place:	Germany
Sources:	Occurs in many rocks, but in large amounts only in such minerals as pitchblende and carnotite.
Use(s):	For many centuries it was used as a pigment for glass. Now it is used as a fuel in nuclear reactors and in bombs.

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