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Selenium is often used in glass to give it a red color, which is useful for signal lights.
Hydrogen selenide, (hydrogen and selenium) gives off a colorless, poisonous, foul-smelling gas.
Selenium is found in metal sulfide ore.
It's used to protect cells from damage, so it is used in antioxidants.
This element is found in lobster, mushrooms, flounder, and shrimp.
It can actually decrease your risk of getting cancer.
Crohn's disease is associated with low levels of selenium.
Too much of this element leads to bad breath, as well as a metallic taste in the mouth.
Selenium exists as silvery metal or powder, usually red.

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Berzelius' composition of selenic acid.

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Atomic number : 34
Atomic mass : 79
Symbol : Se
Group : Oxygen
Melting Point : 220.8°C
Boiling Point : 688 °C
Density : 4.79 g.cm-3 at 20°C
Abundance in Earth's Crust : 5×10-6%

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Biggest Cause of Inflammation Causing Free Radicals

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www.iron-deficiency-symptoms.com The most probable reasons for iron deficiency especially in case of women are the menstrual cycles, uterine and colon cancer, peptic ulcers and long-term ASA use. Moreover, if the diet you follow consists less amounts of iron it can also lead to iron deficiency.

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Selenium is a non metal, discovered in 1817. Jön Jacobs Berzelius was working in a sulfuric acid factory when he found an impurity in the acid. it was seen as a red-brown sediment. He originally thought it was tellurium, but later realized it was a new element. He named it after selene, which means moon, due to it's similarity to tellurium, which means earth.

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Selenium is useful and required in order for humans to survive. Without it, people would die from lack of selenium. Considering it lowers your chance of getting some types of cancer, cancer rates would decrease as well. Many people take selenium just to better their health. It is an important factor in having a healthy immune system. Selenium also helps to reduce high cholesterol levels by a large amount. It even reduces the side effects of chemotherapy. Overall, selenium is very dangerous if it is taken in large amounts over a short period of time, but very much needed if it is used correctly.

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http://education.jlab.org/itselemental/ele034.html
https://www.britannica.com/science/selenium
http://www.webmd.com/a-to-z-guides/supplement-guide-selenium#1
https://www.youtube.com/watch?v=Un0GS0RTrxY
http://www.chemicool.com/elements/selenium.html