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92U238.029
Uranium
ActinideUranium 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.
Phase: Solid
2, 8, 18, 32, 21, 9, 2
Physical Properties
Atomic Mass238.028913 u
Density19.1 g/cm³
Melting Point1405.3 K
Boiling Point4404 K
Molar Heat27.665 J/(mol·K)
Period7
PhaseSolid
Chemical Properties
Electron Configuration1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f3 6d1
Semantic Config[Rn] 5f3 6d1 7s2
Shells2, 8, 18, 32, 21, 9, 2
Electron Affinity50.94 kJ/mol
Electronegativity1.38
Ionization Energies
IE1: 597.6 kJ/molIE2: 1420 kJ/mol
Discovery
Discovered byMartin Heinrich Klaproth