Lutetium (Lu)

From Wikipedia, the free encyclopediaLutetium 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.

Lutetium in the periodic table

SymbolLu
Atomic number71
Group0
Period6
Blockf
Element categoryLanthanide

Physical properties

Phase at STPSolid
Density9.841 g/cm3
Atomic weight174.967 u
Melting point1925 K
1651.85 °C
3005.33 °F
Boiling point3675 K
3401.85 °C
6155.33 °F

Atomära egenskaper

Electronegativity (Pauling Scale)1.27
Electron affinity33.4 kJ/mol
Ionization energies
1523.5 kJ/mol
2 1340 kJ/mol
3 2022.3 kJ/mol
4 4370 kJ/mol
5 6445 kJ/mol

Electron configuration

Electron configuration1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d1 6s2
Electrons per shell2, 8, 18, 32, 9, 2

History

Discovered1906
Discovered byCarl Auer von Welsbach
Georges Urbain