Rare Earth (India) Unit Of Vijay Commercial House

• 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 grey (see picture above). 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
• Relative atomic mass (A_r): 78.96 (3)
• Classification: Non-metallic
• Group in periodic table: 16
• Group name: Chalcogen
• Period in periodic table: 4
• Block in periodic table: p-block
• Electron shell structure: 2.8.18.6

Specification:

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• Item Code: 5N.Se
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