Selenium The Element of The Millennium

How to say Selenium
Selenium can be prepared with either an amorphous or crystalline structure.
Crystalline monoclinic selenium is deep red; crystalline hexagonal selenium,
the most stable variety, is a metallic gray. Elemental selenium is relatively
nontoxic and is considered to be an essential trace element. However,
hydrogen selenide (H2Se) and other selenium compounds are extremely toxic,
and resemble arsenic in their physiological reactions. Hydrogen selenide in a
concentration of 1.5 ppm is intolerable to man. Selenium occurs in some soils
in amounts sufficient to produce serious effects on animals feeding on plants
such as locoweed (an American plant) grown in such soils.

 Atomic Number: 34
Atomic Mass: 78.96
Electronic Configuration: (Ar)3d¹⁰4s²p⁴
Melting Point: 217.0 °C
Boiling Point: 684.9 °C
Density @ 293 K: 4.79 g/cm³

Radii of Selenium atoms and ions in various coordination's:

Alloys:
Photoelectric cells (Cd-Se)
Television cameras
Electrostatic copier and Laser printer drums

Sources:
Byproduct of Copper, Lead, and Zinc production
Uranium roll-front deposits

Each capsule provides provides 200 mcg of Elemental Selenium (selenomethionine). Also contains cellulose, magnesium stearate, silica, and maltodextrin.  Selenium aids Phase III enzyme detoxification of peroxide free radicals; Potentiates the antioxidant activities of other antioxidants; Cardio protective agent; Co-factor with sulfur in amino acid metabolism. Nature's Way Selenomethionine is the organically bound, bioactive form of selenium. Selenium is an essential component of glutathione a potent antioxidant and member of the antioxidant "recycling team." When glutathione is present, vitamin E and vitamin C are recycled into active free radical scavenging forms. Nature's Way yeast-free selenomehionine is a 100% natural, advanced chelated form of selenium with superior absorption

Selenium and its compounds, particularly selenium dioxide and hydrogen selenide, can cause eye irritation. Inhalation of selenium dust, a concentrated mist of selenium, selenium dioxide or hydrogen selenide, can irritate the nose, throat and
bronchial tubes and cause headaches, dizziness and malaise. Exposure to high concentrations of selenium dioxide can cause bronchial spasms, symptoms of asphyxiation and bronchitis.  Ingestion of high doses of selenium compounds can cause pulmonary edema and lung lesions. Acute oral doses of selenium compounds can cause aches and pains, irritability, chills and tremors. Both acute inhalation of and acute oral exposure to selenium compounds cause respiratory distress. Repeated exposure to selenium can cause metallic taste, a garlic odor to the breath, fatigue, irrita-bility, depression and pallor.Repeated exposure to selenium compounds in food can cause dental cavities and loss of nails and hair. Repeated higher exposures to selenium also may cause liver damage. Inhalation of selenium, selenium dioxide and hydrogen selenide can cause indigestion and nausea. Most studies have not found a link between selenium and cancer; there are no studies available about the reproductive effects of selenium. It is not known if selenium causes lung damage. In industrial uses, electronics and photography account for 46% of selenium use; glass industry, 27%; pigments, 14%;
miscellaneous, 13%.