Relative atomic mass: 150.36 +- 0.02

English: Samarium
French: Samarium
Croatian: Samarij
German: Samarium
Italian: Samario
Spanish: Samario

Atomic number: 62
Group numbers: 3
Period: 6
Standard state (20 oC): solid

Discovery: 1879 Paul-Emile Lecoq de Boisbaudran (FR)
Samarium was discovered by Paul-Emile Lecoq de Boisbaudran (FR) in 1879. Named after the mineral samarskite. It is a silvery rare earth metal that is stable in dry air but reacts with water. Oxide coating forms on surfaces exposed to moist air and the metal ignites and burns readily. Samarium is found with other rare earths in monazite sand. It is used in the electronics and ceramics industries. It is easily magnetized and very difficult to demagnetise. This suggests important future applications in solid-state and superconductor technologies. The price of 99.9 % pure samarium ingot is 191.00 for 100 g.
Electronic configuration: [Xe] 4f6 6s2
Formal oxidation number: +2 +3
Atomic radius: 180.4 pm

Electronegativities: 1.17
Thermal conductivity: 13.3 W/(m K)
Electrical resistivity (20 oC): 88 microOhm cm

Melting point: 1074 oC
Boiling point: 1794 oC

Heat of fusion: 10.9 kJ/mol
Heat of vaporization: 164.8 kJ/mol
Heat of atomization: 206.1 kJ/mol

61Pm <= 62Sm => 63Eu

ASCII Periodic Table of the Elements
29 Aug. 2017
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