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

SymbolU
Atomic number92
Group0
Period7
Blockf
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

Atomära egenskaper

Electronegativity (Pauling Scale)1.38
Electron affinity50.94 kJ/mol
Ionization energies
1597.6 kJ/mol
2 1420 kJ/mol

Electron configuration

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

History

Discovered1789
Discovered byMartin Heinrich Klaproth