Samarium
Atomic Number: 62
Symbol: Sm
Atomic Weight: 150.36
Discovery: Boisbaudran 1879 or Jean Charles Galissard de Marignac 1853 (both of France)
Electron Configuration: [Xe] 4f6 6s2
Element Classification: rare earth (lanthanide series)
Name Origin: named for the mineral samarskite.
Density (g/cc): 7.520
Melting Point (°K): 1350
Boiling Point (°K): 2064
Appearance: silvery 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
Debye Temperature (°K): 166.00
Pauling Negativity Number: 1.17
First Ionizing Energy (kJ/mol): 540.1
Oxidation States: 3, 2
Lattice Structure: rhombohedral
Lattice Constant (Å): 9.000
Uses: alloys, in headphones
Source: monazite (phosphate), bastnesite
References: Los Alamos National Laboratory (2001), Crescent Chemical Company (2001), Lange's Handbook of Chemistry (1952)
