Element: promethium |
Name : promethium |
Symbol : Pm |
Atomicnumber : 61 |
Relativeatomicmass : [ 145 ] (longest lived isotope) |
Standardstate : solid at 298 K |
Appearance : metallic |
Classification : Metallic |
Groupinperiodictable : None |
Groupname : Lanthanoid |
Periodinperiodictable : 6 (lanthanoid) |
Blockinperiodictable : f |
Shellstructure : 2.8.18.23.8.2 |
CASRegistry : 7440-12-2 |
Description : Great care is required while handling promethium as a consequence of its radioactivity. |