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( Phosphorus)
Phosphorus (IPA /'f?sf?r?s/) is the chemical element that has the symbol P and atomic number 15. The name comes from the Greek f?? (meaning "light") and f???? (meaning "bearer"). A multivalent nonmetal of the nitrogen group, phosphorus is commonly found in inorganic phosphate rocks. Due to its high reactivity, phosphorus is never found as a free element in nature on Earth. One form of phosphorus (white phosphorus) emits a faint glow upon exposure to oxygen — hence its Greek derivation, F?sf???? meaning "light-bearer" (Latin Lucifer), the planet Venus as "Morning Star". Phosphorus is a component of DNA and RNA, as well as ATP, and is an essential element for all living cells. The most important commercial use of phosphorus-based chemicals is the production of fertilizers. Phosphorus compounds are also widely used in explosives, nerve agents, friction matches, fireworks, pesticides, toothpaste and detergents.
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