Symbol: Pm
Atomic Number: 61
Atomic Weight: 144.9127
Element Classification: Rare Earth Element (Lanthanide Series)
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
Appearance:
Atomic Radius (pm): n/a
Atomic Volume (cc/mol): n/a
Covalent Radius (pm): 163
Ionic Radius: 97.9 (+3e)
Specific Heat (@20°C J/g mol): 0.185
Fusion Heat (kJ/mol): n/a
Evaporation Heat (kJ/mol): n/a
Thermal Conductivity (@25°C W/m K):
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 (Å): n/a
Lattice C/A Ratio: n/a