Samarium
Samaria is a chemical element with atomic number 62, lanthanide. Symbol Sm, at. N. 62; at. m. 150.36. Silver soft metal. Rare earth element. It belongs to lanthanides. The density is 7536 kg / m³, the coil is 1072 ° C, and the boiling point is 1800 ° C. Content of C. in the earth's crust 8 • 10-4%. Below 917oC, the crystalline lattice is rhombohedric, higher - cubic. In nature, there are 6 stable isotopes of 144Sm, 148Sm, 149Sm, 150Sm. 152Sm, 154Sm and one radioactive isotope l47Sm. Airborne, stable, at room temperature, reacts with water, halogens, HCl, HNO3, H2SO4.