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samarium, 
(Sm), chemical element, rare-earth metal of the lanthanoid series of the periodic table. Samarium is silvery white in colour and is relatively stable in air. It was isolated as an impure oxide and spectroscopically identified as a new element (1879) by P.-É. Lecoq de Boisbaudran. Samarium occurs in many other rare-earth minerals but is almost exclusively obtained from monazite; it is also found in the products of nuclear fission. Ion-exchange techniques are used for its commercial separation and purification. The metal is conveniently prepared by the thermoreduction of its oxide, Sm2O3, with lanthanum metal, ... (100 of 367 words)
Aspects of the topic samarium are discussed in the following places at Britannica.
Articles from Britannica encyclopedias for elementary and high school students.
hardest rare-earth metal of cerium group, this bright silvery-white metal element is found in monazite and other minerals and as a product of nuclear fission. It is used in electronics and ceramics industries and to make special luminescent and infrared-absorbing glasses. Oxide is used in control rods of nuclear reactors. Samarium compound is used to make magnets. It was discovered in 1879 by Lecoq de Boisbaudran.
"samarium." Encyclopædia Britannica. Encyclopædia Britannica Online. Encyclopædia Britannica, 2011. Web. 09 Apr. 2011. <http://www.britannica.com/EBchecked/topic/520309/samarium>.
samarium. (2011). In Encyclopædia Britannica. Retrieved from http://www.britannica.com/EBchecked/topic/520309/samarium
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