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Samarium Facts

Chemical & Physical Properties

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Samarium is a lustrous silvery metal. Three crystal modifications also exist.

Samarium is a lustrous silvery metal. Three crystal modifications also exist.

JKleo, wikipedia.org
Periodic Table of the Elements

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)

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