Chalcogen
The chalcogens (/ˈkælkədʒᵻnz/) are the chemical elements in group 16 of the periodic table. This group is also known as the oxygen family. It consists of the elements oxygen (O), sulfur (S), selenium (Se), tellurium (Te), and the radioactive element polonium (Po). The chemically uncharacterized synthetic element livermorium (Lv) is predicted to be a chalcogen as well. Often, oxygen is treated separately from the other chalcogens, sometimes even excluded from the scope of the term "chalcogen" altogether, due to its very different chemical behavior from sulfur, selenium, tellurium, and polonium. The word "chalcogen" is derived from a combination of the Greek word khalkόs (χαλκός) principally meaning copper (the term was also used for bronze/brass, any metal in the poetic sense, ore or coin), and the Latinised Greek word genēs, meaning born or produced.
Sulfur has been known since antiquity, and oxygen was recognized as an element in the 18th century. Selenium, tellurium and polonium were discovered in the 19th century, and livermorium in 2000. All of the chalcogens have six valence electrons, leaving them two electrons short of a full outer shell. Their most common oxidation states are −2, +2, +4, and +6. They have relatively low atomic radii, especially the lighter ones.
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Sheila Ki Jawani
by: Sunidhi ChauhanI Know You Want It But You Never Gonna Get It Tere Hath Kabhi Na Ani
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Hey Hey I Know You Want It But You Never Gonna Get It Tere Hath Kabhi Na Ani
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Ab Dil Karta Hai Haule Haule Se Main Toh Khud Ko Gale Lagaun
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Ab Dil Karta Hai Haule Haule Se Main Toh Khud Ko Gale Lagaun
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