Trinket. Gadolinium.

<div>   </div> <div> <strong> Atomic number <span class = "Apple-tab-span" style = "white-space: pre;"> </span>   64 </strong> </div> <div> <strong> Atomic mass <span class = "Apple-tab-span" style = "white-space: pre;"> </span>     157.25 </strong> </div> <div> <strong> Density, kg / m? <span class = "Apple-tab-span" style = "white-space: pre;"> </ span >   7890 </strong> </div> <div> <strong> Temperature</strong></div> <div> <strong> melting, ° С       <span class = "Apple-tab-span" style = "white-space: pre;"> </span>1312</strong></div> <div>   </div> <div > Gadolinium is a soft, tough, silvery-white metal. Gadolinium was discovered in 1880 by Jean de Marignac, who spectroscopically proved the presence of a new element in a mixture of rare earth oxides. Named after the Finnish chemist Yuri Gadolin. Gadolinium is a part of lanthanide ores, which are often found in the USA, Kazakhstan, Russia, Ukraine, Australia, Brazil, India, Scandinavia. </div> <div>   </div>