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Petra Kučerová Michaela SalajkováPhosphorus Petra Kučerová Michaela Salajková
Physical properties Non-metallic Density: 1,83 g/cm3Melting point: 41 °C Boiling point: 277 °C Standart state: solid Colour: white, red and black
Chemical properties The 15th group of periodic table3 alotropic modifications Insoluble in water Soluble in carbon disulphide (= rozpustný v sirouhlíku) Biogenic element
White phosphorus Waxy (= měkký jako vosk) Toxic Pyrophoric(= samozápalný) Phosphorescing vapors (= fosforeskující páry) Very reactive By heating to 250 °C changes into the red modification
Red phosphorus Non-toxic Less reactive than the white oneAmorphous substance (= amorfní látka) Stable on air
Black phosphorus Crystal structure Metallic lustre (= kovový lesk)Heat conductor (= vodič tepla) Conductor of electric current (= vodič el. proudu) The least reactive of all modifications Non-toxic
History Discovered in 1669 by Hennig BrandIsolated from urine (= získán z moči) Name – from Greek - Phosphoros = „bringer of light“ Když hledal kámen moudrosti
Occurence (= výskyt) Only compounds (apatite, phosphorite)Heavy occurence in the earth´s crust (= zemská kůra)
Uses 1 Safety matches Pyrotechnics Coca-colaBone-ash - monocalcium phosphate – baking powder (= kostní moučka; prášek do pečiva)
Uses 2 Fertilizers (= hnojiva) Pesticides Alloys (= slitiny)Clean agents Water softeners
Hazards and risks 0,1 g of white phosphorus is deadly toxicChronic poisoning of white phosphorus leads to necrosis of the jaw („phossy jaw“)
Thanks for your attention
Phosphorus Atomic Number:15 Atomic Symbol:P Atomic Weight: Electron Configuration:[Ne]3s 2 3p 3 History (Gr. phosphoros, light bearing; ancient.
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