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phosphorus
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nature : Periodic System No. ?main group (group N) elements. Atomic number 15. Stable isotopes : 31. Amu 30.973761. The main valence +1, +3 and +5. Hydroxyapatite is a major ore. Monomer with a three-allotropism : white phosphorus (also known as yellow phosphorus), and red phosphorus and phosphorus. White phosphorous is a colorless to pale yellow solid cereus. The Department issued a phosphorescence. Dioxin is the quality and comfortable. Highly toxic! Together with steam volatile. Density 1.82 ° C 44.1 ° C melting point. The boiling point 257 ° C. Fire at 34 ° C, 60 ° C in air burning themselves into white smoke. Almost insoluble in water, soluble in ethanol and difficult glycerol, more soluble in ether, benzene, carbon disulfide, etc.. From calcium phosphate (ashes, apatite, etc.) with a total of silica and carbon in the furnace heat, generated by the rapid cooling of phosphorus vapor derived. Red phosphorus is reddish brown powder. Nontoxic. Density 2.20. Melting point 590 ° C (4.3 MPa, 43 atmospheres). Fire point at 400 ° C and above. Do not dissolve in water, slightly soluble in ethanol. Do not dissolve in organic solvents and carbon disulfide. All biological phosphate in the energy transfer process, such as metabolism, photosynthesis, nerve and muscle function activities play an important role. For two-thirds of the phosphorus fertilizer, but also for the manufacture of phosphoric acid, fireworks, matches, pesticides and detergents (3 poly phosphate), but the latter negative impact on the ecological environment greatly. From white phosphorus in the inert gas in enclosed containers for heating to 250 ° C derived. White phosphorus under high pressure heating, while the slightly metallic black phosphorus, can conduct electricity, not dissolved in the solvent general, phosphorus is the same allotropy the most stable.


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More Detailed Data:
1) phosphorus
2) Phosphorus;phosphorous, yellow;phosphorous ,red
3) phosphorus
4) phosphorus
5) Phosphorus red;Phosphorus
6) phosphoruswhite;phosphorusyellow
7) phosphoruswhite;phosphorusyellow
8) ferrophosphorus
9) ferrophosphorus
10) ferrophosphorus
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