Lutetium

Symbol | Lu
Latin name | Lutecium
Atomic number | 71
Period | 6
Element category | Inner transition elements
Relative atomic mass | 174.967
Group | III.B
Electronegativity | 1.2
Oxidation numbers | 3
Electron configuration | 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6 4f14 5d1 6s2
Density [g/cm3] | 9.842
State | Solid
Melting point [°C] | 1663
Boiling point [°C] | 3395
Atomic radius [pm] | 217
Covalent radius [pm] | 160
Thermal conductivity [W m-1K-1] | 16.4
Heat capacity [J K-1g-1] | 0.15
Discovery | 1907
Vickers hardness [MPa] | 1160
Brinell hardness [MPa] | 893
Young's modulus [GPa] | 69
Electrical conductivity [S m-1] | 1.8 · 106
Shear modulus [GPa] | 27
1.st ionization energy [eV] | 5.4259
2.nd ionization energy [eV] | 13.888
3.rd ionization energy [eV] | 20.957
Stable isotopes | 2
Unstable isotopes | 21