Praseodymium

Symbol | Pr
Latin name | Praseodymium
Atomic number | 59
Period | 6
Element category | Inner transition elements
Relative atomic mass | 140.90765
Group | III.B
Electronegativity | 1.2
Oxidation numbers | 3, 4
Electron configuration | 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6 4f3 5d0 6s2
Density [g/cm3] | 6.773
State | Solid
Melting point [°C] | 931
Boiling point [°C] | 3212
Atomic radius [pm] | 247
Covalent radius [pm] | 164
Thermal conductivity [W m-1K-1] | 12.5
Heat capacity [J K-1g-1] | 0.193
Discovery | 1885
Vickers hardness [MPa] | 400
Brinell hardness [MPa] | 481
Young's modulus [GPa] | 37
Electrical conductivity [S m-1] | 1.4 · 106
Shear modulus [GPa] | 15
1.st ionization energy [eV] | 5.464
2.nd ionization energy [eV] | 10.551
3.rd ionization energy [eV] | 21.62
Stable isotopes | 1
Unstable isotopes | 14