Promethium

Symbol | Pm
Latin name | Promethium
Atomic number | 61
Period | 6
Element category | Inner transition elements
Relative atomic mass | 146.9151
Group | III.B
Electronegativity | 1.2
Oxidation numbers | 3
Electron configuration | 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6 4f5 5d0 6s2
Density [g/cm3] | 7.23
State | Solid
Melting point [°C] | 1168
Boiling point [°C] | 2460
Atomic radius [pm] | 205
Thermal conductivity [W m-1K-1] | 17.9
Discovery | 1945
Young's modulus [GPa] | 46
Electrical conductivity [S m-1] | 1.3 · 106
Shear modulus [GPa] | 18
1.st ionization energy [eV] | 5.55
2.nd ionization energy [eV] | 10.903
3.rd ionization energy [eV] | 22.283
Stable isotopes | 0
Unstable isotopes | 14