| Symbol |
Pm |
|
| Atomic Number |
61 |
Relative Atomic Mass
12C = 12.0000 |
144.9127 (145Pm) |
Atomic Radius
pm |
181 |
First Ionisation Energy
kJ mol-1 |
535.9 |
| Electronegativity |
n/a |
Density
kg m-3 |
7220 [298 K] |
Molar Volume
cm3 |
20.1 |
Thermal Conductivity
W m-1 K-1 |
17.9 [300 K] (est.) |
Melting Point
K |
1441 |
Boiling Point
K |
c. 3000 |
| Number of Isotopes |
27 |
Ground State Electron
Configuration |
[Xe]4f55s2 |
| Term Symbol |
6H5/2 |
| Discovery |
Discovered by J.A. Marinsky, L.E. Glendenin and C.D. Coryell (Oak Ridge, Tennessee, USA) in 1945 |
| Name Derived From |
Named after Prometheus (from Greek mythology) |
Name in Other
Languages |
 Croatian | Prometij |
 Danish | promethium |
 Dutch | promethium |
 Finnish | prometium |
 French | prométhium |
 German | Promethium |
 Italian | prometio |
 Norwegian | promethium |
 Portuguese | promécio |
 Spanish | prometio |
 Swedish | prometium |
| Peter van der Krogt's Element Multidict - element name translations in over 48 langauges |
