Samarium - ASCII Periodic Table of the Elements

ASCII PERIODIC TABLE OF THE ELEMENTS

  Sm

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 °C): solid

Discovery: 1879 Paul-Émile Lecoq de Boisbaudran (FR)

Samarium was discovered by Paul-Émile 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.

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 °C): 88 μΩcm

Melting point: 1074 °C
Boiling point: 1794 °C

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