Er. Chemical button 18 mm.

<div>   </div> <div> <strong> Atomic number     <span class = "Apple-tab-span" style = "white-space: pre;"> </span> 68 </ strong> </div> <div> <strong> Atomic mass   <span class = "Apple-tab-span" style = "white-space: pre;"> </span>167,26</strong></div> <div> <strong> Density, kg / m? < span class = "Apple-tab-span" style = "white-space: pre;"> </span>   9050 </strong> </div> <div> <strong> Temperature </strong></div> <div> <strong> melting, ° С <span class = "Apple-tab-span" style = "white- space: pre; "> </span>       1497 </strong> </div> <div>   </div> <div> Erbium is a soft malleable silver metal. Erbium was first isolated in 1843 by the Swedish chemist C.G. Mosander, from a mineral found near the village of Ytterby. </div> <div> Along with three more chemical elements (terbium, ytterbium, yttrium) it was named after the village of Ytterby, located on the island of Resare, part of the Stockholm archipelago. </div>