1. Phosphorus Marcela Pryclová Bohumila Vlčková

2. Discovery (1630- 1692) Hamburk Germany alchemist 1669 – Hennig Brandt, preparation from urine

3. = „light bearing“ crystal structure of phosphorus Kossel shell structure of phosphorus light bearing- svítivý

4. Occurrence found in inorganic phosphate rocks all living cells- essential element for living organisms never found as a free element in nature inorganic- anorganický

5. Properties non-metalic phosphorus forms a waxy white solid characteristic smell as garlic high reactivity three forms: white, red, black waxy- voskový

6. Red hard, low reactivity, insoluble warming white phosphorus, non-poisonous safety matches insoluble- nerozpustný non-poisonous- nejedovatý safety matches- bezpečnostní zápalky

7. White soft high reactivity self- iqnition phosphorescent disinfestation self- iqnition- samovznítitelný phosphorescent- fosforeskující disinfestation- deratizace

8. Black (metal) low reactivity insoluble conductive non-poisonous conductive- vodivý

9. Applications production of fertilizers explosives, fireworks, pesticides, toothpaste, detergents safety matches fertilizers- hnojiva explosives- výbušniny fireworks- ohňostroj

10. Compounds H 3 PO 4 - phosphoric acid- electrolyt Na 3 PO 4 – cleaning Na 2 HPO 4 – foodstuffs industry (NH 4 ) 2 HPO 4, NH 4 H 2 PO 4 – fertilizes NH 4 H 2 PO 4 – fire extinguisher

11. URL http://en.wikipedia.org/wiki/Phosphorus http://www.tabulka.cz/prvky/ukaz.asp?id=1 5http://www.tabulka.cz/prvky/ukaz.asp?id=1 5