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U
in WebElements
in X-Ray info
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U, 92
uranium (English)
uranium, m. (French)
Uran, n. (German)
uran (Russian)
uranio (Spanish)
uran (Swedish)
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| Symbol, number | U, 92 (metal) |
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| Weight | 238.0289 |
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| In Nature | |
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| Discovered | 1789, by Martin Heinrich Klaproth (Germany) |
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| Density [kg/m3] | 18950 [293 K] (solid) 17907 [1405 K] (liquid) |
| Molar volume | 12.56 cm3 |
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| Melting Temperature | 1405.5 K (1132.5 °C) Enthalpy: 422.6 kJ/mol |
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| Boiling Temperature | 4018 K (3745 °C) Enthalpy: 15.5 kJ/mol |
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| Electrical resistance | 30.8E-8 [273 K] Wm |
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| Thermal | Conductivity: 27.6 [300 K] W/Km Expansion: 12.6E-6 /K |
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| Ionisation [kJ/mol] |
| M--> |
M+--> |
M2+--> |
M3+--> |
M4+--> |
M5+--> |
M6+--> |
M7+--> |
M8+--> |
M9+-->M10+ |
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| Thermodynamics |
| State |
DfH° |
DfG° |
S° |
CpH |
H°298.15-H°0 |
| [kJ/mol] |
[J/Kmol] |
[kJ/mol] |
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| Isotopes |
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Mass |
In nature |
Half-life |
Spin |
m/mN |
NMM |
Decay |
| 230U |
230.03393 |
|
20.8 d |
0 |
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α to 226Th |
| 231U |
231.03626 |
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4.2 d |
5/2 |
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α to 227Th |
| 232U |
232.03715 |
|
68.9 y |
0 |
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α to 228Th |
| 233U |
233.039628 |
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1.59E5 y |
5/2 |
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0.59 |
α to 229Th; SF |
| 234U |
234.0409468 |
0.0055% |
2.45E5 y |
0 |
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α to 230Th; SF |
| 235U |
235.0439242 |
0.7200% |
7.04E8 y |
7/2 |
-0.35 |
0.38 |
α to 231Th; SF |
| 236U |
236.045561 |
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2.34E7 y |
0 |
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α to 232Th; SF |
| 237U |
237.048723 |
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6.75 d |
1/2 |
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β- to 237Np |
| 238U |
238.0507847 |
99.2745% |
4.46E9 y |
0 |
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α to 234Th; SF |
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