Basics+of+Selenium

=//Selenium//= //__Selenium, otherwise known as SE, has a number of 34. Its atomic number is 78.96. Pure selenium is often found in a ruby red color, when selenium is red it in a powder state. At room temperature selenium is a solid and it melts at a ridiculously high temperature, 684.9 degrees Celsius. This element is non metal. Unfortunately most selenium that we mine today is not pure. It is mostly mixed with iron and other metallic matter. When this happens the compound becomes a grey color.__// //__Selenium was discovered by Jons Jacob Berzelius. He discovered it while in a Swedish factory. The Selenium was contaminating the sulfuric acids. HE originally thought that it was tellurium and then after some experiments he saw that it had more impurities than tellurium. So he discovered Selenium by looking at the run off acids in the factory. He named it Selenium because the Greek word for moon is Selene. Today most selenium is found by mining copper. So when he first saw it he saw small rare deposits.__//

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