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 |