samarium
Sam is a chemical symbol with a chemical symbol of Sm and an atomic number of 62. This is a medium hardness silver-white metal that is easily oxidized in the air. As a typical component of the lanthanide series, the samarium is usually assumed to be in the oxidation state +3. Samarium (II) compounds, and most commonly SmO (samarium oxide (II)), SmS, SmSe and SmTe. The last compound in chemical synthesis is a common reducing agent. Sam has no significant biological effect, only mild toxicity. Sam was discovered in 1879 by the French chemist Paul Émile Lecoq de Boisbaudran and named with its mineralized samarskite. This mineral was named as a Russian mining official, Colonel Vasili Samarsky-Bykhovets, albeit indirectly, he became the first person to name a chemical element in his own name. Although samarium is classified as a rare earth element but is the most abundant element in the crust, it is more common than tin and other metals. The proportion of samarium in a variety of minerals is as high as 2.