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Phosphorus-40
Although phosphorus (15P) has 23 isotopes from 25P to 47P, only 31P is stable; as such, phosphorus is considered a monoisotopic element. The longest-lived radionuclide, radioactive isotopes are 33P with a half-life of 25.34 days and 32P with a half-life of 14.268 days. All others have half-lives of under 2.5 minutes, most under a second. The least stable is 25P with a half-life shorter than 30 nanoseconds. List of isotopes , - , rowspan=3, 24P?The existence of this isotope has not been experimentally confirmed; given data is inferred or estimated from periodic trends. , rowspan=3 style="text-align:right" , 15 , rowspan=3 style="text-align:right" , 9 , rowspan=3, 24.03652(54)# , rowspan=3, , p? , 23Si , rowspan=3, 1+# , rowspan=3, , rowspan=3, , - , β+? , 24Si , - , β+, p? , 23Al , - , 25P? , style="text-align:right" , 15 , style="text-align:right" , 10 , 25.02119(43)# , 200 ns] , β− , 45S , 1/2+# , , , - , 46P , style="text-align:right" ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phosphorus
Phosphorus is a chemical element with the 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 0.06 grams). In minerals, phosphorus generally occurs as phosphate. Elemental phosphorus was first isolated as white phosphorus in 1669. White phosphorus emits a faint glow when exposed to oxygen – hence the name, taken from Greek mythology, meaning 'light-bearer' (Latin ), referring to the " Morning Star", the planet Venus. The term '' phosphorescence'', meaning glow after illumination, derives from this property of phosphorus, although the word has since been used for a different physical process that produces a glow. The glow of phosphorus is caused by oxidation of the white (but not red) phosphorus — a process now called chem ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
