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Phosphorus is a chemical element; it has symbol P and atomic number 15. Elemental phosphorus exists in two major forms, white phosphorus and red phosphorus, but because it is highly reactive, phosphorus is never found as a free element on Earth. It has a concentration in the Earth's crust of about one gram per kilogram (compare copper at about ...
Phosphorus comprises 0.1% by mass of the average rock [11] (while, for perspective, its typical concentration in vegetation is 0.03% to 0.2%), [12] and consequently there are quadrillions of tons of phosphorus in Earth's 3×10 19-ton crust, [13] albeit at predominantly lower concentration than the deposits counted as reserves, which are ...
The single-bonded oxygen atoms that are not shared are completed with acidic hydrogen atoms. The general formula of a phosphoric acid is Hn+2−2xPnO3n+1−x, where n is the number of phosphorus atoms and x is the number of fundamental cycles in the molecule's structure, between 0 and n + 2 2 . Pyrophosphate anion. Trimethyl orthophosphate.
Chemical symbol. The periodic table, elements being denoted by their symbols. Chemical symbols are the abbreviations used in chemistry, mainly for chemical elements; but also for functional groups, chemical compounds, and other entities. Element symbols for chemical elements, also known as atomic symbols, normally consist of one or two letters ...
Alchemical symbols were used to denote chemical elements and compounds, as well as alchemical apparatus and processes, until the 18th century. Although notation was partly standardized, style and symbol varied between alchemists. Lüdy-Tenger [1] published an inventory of 3,695 symbols and variants, and that was not exhaustive, omitting for ...
Phosphor thermometry. Phosphor thermometry is a temperature measurement approach that uses the temperature dependence of certain phosphors. For this, a phosphor coating is applied to a surface of interest and, usually, the decay time is the emission parameter that indicates temperature.
Isotopes of phosphorus. Although phosphorus (15 P) has 22 isotopes from 26 P to 47 P, only 31 P is stable; as such, phosphorus is considered a monoisotopic element. The longest-lived radioactive isotopes are 33 P with a half-life of 25.34 days and 32 P with a half-life of 14.268 days. [3][4] All others have half-lives of under 2.5 minutes, most ...
Phosphorus (Ancient Greek: Φωσφόρος, romanized: Phōsphoros) is the god of the planet Venus in its appearance as the Morning Star. Another Greek name for the Morning Star is " Eosphorus " (Ancient Greek: Ἑωσφόρος , romanized: Heōsphoros ), which means "dawn-bringer".