Selenium is a chemical element. It can be said to be a pure substance; there is nothing else found in it.
Selenium is a nonmetallic element with an atomic number of 34 and an atomic weight of 78.96. Its chemical symbol is Se. Selenium is most commonly found in nature in its inorganic form, sodium selenite. An organic form of selenium, selenomethionine, is found in foods
Selenium is not a common element but is necessary.
Selenium is found in the amino acids selenomethionine, selenocysteine, and methylselenocysteine.
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It is found either as a red amorphous powder or as a black powder (the two allotropes of selenium)
Selenium is a nonmetallic element with an atomic number of 34 and an atomic weight of 78.96. Its chemical symbol is Se. Selenium is most commonly found in nature in its inorganic form, sodium selenite. An organic form of selenium, selenomethionine, is found in foods
Selenium is indeed a chemical, and more specifically, it is a chemical element. It can be found on the periodic table of the elements.
The element Selenium is very poisonous, yet your body needs tiny amount of it to be healthy. Most commonly, selenium is found in dandruff shampoos.
Selenium is stored in the heart, kidney, lung, liver, pancreas and muscle tissue. Selenium is found in nuts, meat, mushrooms, fish and eggs.
I have found this on Wikipedia.com... Jons Jakob Berzelius founded Selenium associated with Tellerium in 1817. I sure hope this helps!!!
See this link.