Trinket. Dysprosium.

<div>   </div> <div> <strong> Atomic number     <span class = "Apple-tab-span" style = "white-space: pre;"> </span>66</strong></div> <div> <strong> Atomic mass <span class = " Apple-tab-span "style =" white-space: pre; "> </span>     162,50 </strong> </div> <div> <strong> Density, kg / m? <Span class = "Apple-tab-span" style = "white-space: pre;"> </span> & nbsp ; 8540 </strong> </div> <div> <strong> Temperature </strong></div> <div> <strong> melting, ° С       <span class = "Apple-tab-span" style = "white-space: pre;"> </span>1407</strong></div> <div>   </div> <div > Dysprosium is a rare earth metal with the luster of silver. It is not found in nature in its pure form, but is a part of some minerals, for example, xenotime.m P.E. Lecoq de Boisbaudran discovered dysprosium in 1886 during spectroscopic analysis of holmium, or holmium earth, and then isolated the oxide. In 1906 J. Urbain received pure dysprosium. </div>