| From Wikipedia, the free encyclopediaUranium is a chemical element with symbol U and atomic number 92. It is a silvery-white metal in the actinide series of the periodic table. A uranium atom has 92 protons and 92 electrons, of which 6 are valence electrons. | |||||
Uranium in the periodic table | |||||
|---|---|---|---|---|---|
| Symbol | U | ||||
| Atomic number | 92 | ||||
| Group | 0 | ||||
| Period | 7 | ||||
| Block | f | ||||
| Element category | Actinide | ||||
Physical properties | |||||
| Phase at STP | Solid | ||||
| Density | 19.1 g/cm3 | ||||
| Atomic weight | 238.029 u | ||||
| Melting point | 1405.3 K 1132.15 °C 2069.87 °F | ||||
| Boiling point | 4404 K 4130.85 °C 7467.53 °F | ||||
Atomära egenskaper | |||||
| Electronegativity (Pauling Scale) | 1.38 | ||||
| Electron affinity | 50.94 kJ/mol | ||||
| Ionization energies |
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Electron configuration | |||||
| Electron configuration | 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 5f3 6s2 6p6 6d1 7s2 | ||||
| Electrons per shell | 2, 8, 18, 32, 21, 9, 2 | ||||
History | |||||
| Discovered | 1789 | ||||
| Discovered by | Martin Heinrich Klaproth | ||||