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71Lu174.967
Lutetium
LanthanideLutetium is a chemical element with symbol Lu and atomic number 71. It is a silvery white metal, which resists corrosion in dry, but not in moist air. It is considered the first element of the 6th-period transition metals and the last element in the lanthanide series, and is traditionally counted among the rare earths.
Phase: SolidAppearance: silvery white
2, 8, 18, 32, 9, 2
Physical Properties
Atomic Mass174.96681 u
Density9.841 g/cm³
Melting Point1925 K
Boiling Point3675 K
Molar Heat26.86 J/(mol·K)
Period6
PhaseSolid
Chemical Properties
Electron Configuration1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d1
Semantic Config[Xe] 4f14 5d1 6s2
Shells2, 8, 18, 32, 9, 2
Electron Affinity33.4 kJ/mol
Electronegativity1.27
Ionization Energies
IE1: 523.5 kJ/molIE2: 1340 kJ/molIE3: 2022.3 kJ/molIE4: 4370 kJ/molIE5: 6445 kJ/mol
Discovery
Discovered byGeorges Urbain