Element overview
Promethium (Pm) is element 61 with a listed atomic mass of 145 u. Its group is not assigned and period 6. Its category is lanthanide.
Atomic properties
Electron configuration: not listed. Electronegativity: not established. Common oxidation states: not listed.
Physical properties
Density: not listed; melting point: not listed; boiling point: not listed. Values depend on conditions, phase and source.