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compare and contrast; Phosphorus and Sulphur

Chemistry
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Phosphorus is less electronegative than sulpher Phospherous is larger than sulpher phosphorous is found in DNA but not found in amino acids (Exceptions may apply) Sulpher is found in amino acids but not in DNA (Exceptions may apply) They both in some cases can ignore the octet rule see: http://chemed.chem.wisc.edu/chempaths/GenChem-Textbook/Exceptions-to-the-Octet-Rule-573.html hope this is helpful
Sulfur was known to the ancients, and occurs as the native element. Phosphorus was the first element discovered in the modern era, in the 1660s, by Brand, through boiling a great deal of urine. The element is named "phosphorus" (Greek for "light bringer") because the pure element reduced oxygen in the air so well that it spontaneously glows, if not bursts into flame. Generally it has to be kept under oil. Both exist in a number of allotropes with notably different properties. Sulfur in particular has some very strange physical properties (e.g. changes in viscosity) as it is heated and proceeds through various molecular, oligomeric, and even polymeric forms. Both are common elements in the Earth's crust, being formed in large quantities by fusion of oxygen nuclei in the center of large stars. Phosphorus is most often found oxidized, as phosphates, while sufur is found both as sulfates and sulfides. Many important metal ores, particular those from the right side of the Periodic Table, are sulfides. These are often reduced by first roasting in air, which converts the sulfide to an oxide, and then by reduction of the oxide, e.g. with carbon. While historically a lot of sulfur was mined from deposits of the native element, particularly in Louisiana, the modern source tends to be H2S which contaminates natural gas wells and has to be removed anyway. The most common industrial use is to oxidize the sulfur and use it to make H2SO4, the industrial chemical made in greatest volume.

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