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Uranium (U)

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

Atomic number92
Element categoryActinide

Physical properties

Phase at STPSolid
Density19.1 g/cm3
Atomic weight238.029 u
Melting point1405.3 K
1132.15 °C
2069.87 °F
Boiling point4404 K
4130.85 °C
7467.53 °F

Atomic properties

Electronegativity (Pauling Scale)1.38
Electron affinity50.94 kJ/mol
Oxidation states+1, +2, +3, +4, +5, +6
(an amphoteric oxide)
Ionization energies
1597.6 kJ/mol
21420 kJ/mol
31900 kJ/mol
43145 kJ/mol

Electron configuration

Elektronkonfiguration (shorthand)[Rn] 5f3 6d1 7s2
Electron configuration1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 5f3 6s2 6p6 6d1 7s2
Electrons per shell2, 8, 18, 32, 21, 9, 2


Discovered byMartin Heinrich Klaproth
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