Promethium
Symbol
Pm
Atomic Number
61
Atomic Weight
144.9127
Element Classification
Discovered By
J.A. Marinsky, L.E. Glendenin, C.D. Coryell
Discovery Date
1945 (United States)
Name Origin
Named for the Greek god, Prometheus.
Density (g/cc)
7.2
Melting Point (K)
1441
Boiling Point (K)
3000
Atomic Radius (pm)
n/a
Atomic Volume (cc/mol)
n/a
Covalent Radius (pm)
163
Ionic Radius
97.9 (+3e)
Specific Heat
0.185
Fusion Heat (kJ/mol)
n/a
Evaporation Heat (kJ/mol)
n/a
Thermal Conductivity (@25°C W/m K)
17.9
Debye Temperature (K)
n/a
Pauling Negativity Number
0.0
First Ionizing Energy (kJ/mol)
536
Oxidation States
3
Electronic Configuration
[Xe] 4f5 6s2
Lattice Structure
(n/a)
Lattice Constant
n/a
Lattice C/A Ratio
n/a
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