Samarium

Samarium is a chemical element with symbol Sm and atomic number 62. It is a moderately hard silvery metal that readily oxidizes in air. Being a typical member of the lanthanide series, samarium usually assumes the oxidation state +3. Compounds of samarium(II) are also known, most notably the monoxide SmO, monochalcogenides SmS, SmSe and SmTe, as well as samarium(II) iodide. The last compound is a common reducing agent in chemical synthesis. Samarium has no significant biological role and is only slightly toxic.
Symbol: Sm
Electron configuration: Xe 4f6 6s2
Atomic number: 62
Discovered: 1879
Melting point: 1,074 °C
Atomic mass: 150.36 ± 0.02 u