Keychain. Strontium.

<div>   </div> <div> <strong> Atomic number <span class = "Apple-tab-span" style = "white-space: pre;"> </span>         38 </strong> </div> <div> <strong> Atomic mass <span class = "Apple-tab-span" style = "white-space: pre;"> </span>           87.62 </strong> </div> <div> <strong> Density, kg / m? <span class = "Apple-tab-span" style = "white-space: pre;"> </ span >         2600 </strong> </div> <div> <strong> Temperature</strong></div> <div> <strong> melting, ° С           <span class = "Apple-tab-span" style = "white-space: pre;"> </span>768</strong></div> <div>   </div> <div> Strontium is a soft, malleable and ductile alkaline earth metal of a silvery-white color. </div> <div> The new element was found in the strontianite mineral, found in 1764 in a lead mine near the Scottish village of Stronti? an, which later gave the name to the new element. The presence of a new metal oxide in this mineral was established in 1787 by William Cruykshenck and Ader Crawford. It was isolated in its pure form by Sir Humphrey Davy in 1808. </div> <div> Strontium does not occur in free form. It is found in about 40 minerals. The main areas of application of strontium and its chemical compounds are the radio-electronic industry, pyrotechnics, metallurgy, food industry. </div> <div>   </div>