Symbol: Sm
Atomic Number: 62
Atomic Weight: 150.36
Element Classification: Rare Earth Element (Lanthanide Series)
Discovered By: Jean Charles Galissard de Marignac
Discovery Date: 1853 (France)
Name Origin: Named after the mineral samarskite.
Density (g/cc): 7.520
Melting Point (K): 1350
Boiling Point (K): 2064
Appearance: Silvery rare-earth metal
Atomic Radius (pm): 181
Atomic Volume (cc/mol): 19.9
Covalent Radius (pm): 162
Ionic Radius: 96.4 (+3e)
Specific Heat (@20°C J/g mol): 0.180
Fusion Heat (kJ/mol): 8.9
Evaporation Heat (kJ/mol): 165
Thermal Conductivity (@25°C W/m K):
Debye Temperature (K): 166.00
Pauling Negativity Number: 1.17
First Ionizing Energy (kJ/mol): 540.1
Oxidation States: 3, 2
Electronic Configuration: [Xe] 4f⁶ 6s²
Lattice Structure: Rhombohedral (RHL)
Lattice Constant (Å): 9.000
Lattice C/A Ratio: n/a