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METALS
non-METALS
Phosphorus
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30Times New Romantrue
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<h1 align="center">
Phosphorus is a chemical element with symbol P and atomic number 15. As
an element, phosphorus exists in two major forms—white phosphorus and
red phosphorus—but due to its high reactivity, phosphorus is never found
as a free element on Earth. Instead phosphorus-containing minerals are
almost always present in their maximally oxidised state, as inorganic
phosphate rocks. The first form of elemental phosphorus to be produced
(white phosphorus, in 1669) emits a faint glow upon exposure to oxygen –
hence its name given from Greek mythology, Φωσφόρος meaning
"light-bearer" (Latin Lucifer), referring to the "Morning Star", the
planet Venus (or Mercury). The term "phosphorescence", meaning glow
after illumination, originally derives from this property of phosphorus,
although this word has since been used for a different physical process
that produces a glow. The glow of phosphorus itself originates from
oxidation of the white (but not red) phosphorus— a process now termed
chemiluminescence. Together with nitrogen, arsenic, and antimony,
phosphorus is classified as a pnictogen.
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30Times New Romantrue