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Atomic number (Z) 9 electron configuration [He] 2s 2p atomic mass 19 gas substances oral b 3000 Being young Yellow freezing point (0 C) -220 Boiling point (0 C) -188 Density (g / cm 3) 1.69 x 10 Solubility in water (g / ml) reacts first ionization energy (kJ / mol) 1681 electron affinity (kJ / mol) -328 Electronegativities (Pauling scale) 4.0 standard reduction potential (volts) X 2 + 2e - 2X - 2 , 87 atomic radius (pm) 72 The radius of the covalent (Å) 0.64 The radius of the ion (X -) (Å) 1.19 XX bond energy (kJ / mol) 155 History
In 1529, Georigius Agricola described the use of fluorspar as a tracer compound flow in the body, and in early 1670, Schwandhard found that glass etched when exposed to fluorspar that was given acid. Scheele and many other experts, including Davy, Gay-Lussac, Lavoisier, and Thenard experimented with hydrofluoric acid, and some experimentation oral b 3000 with a tragic ending. The final fluorine could be isolated in 1886 by Moissan after trying for nearly 74 years. The properties
Fluorine is the most electronegative element and reactive when compared to all the elements. In the form of gas is a diatomic molecule (F ), pale yellow, oral b 3000 corrosive gas, reacts with many organic and inorganic compounds. Metals, glass, ceramics, carbon, and even water burn in fluorine with a bright flame. The presence oral b 3000 of fluorine in drinking water component exceeds 2 ppm can cause black coating on the teeth.
The element fluorine and fluoride ions are highly toxic. The free element has a characteristic pungent odor, detectable in concentrations as low as 20 ppb, which is below the level of security work. Concentration allowed for exposure for 8 hours is 1 ppm.
Fluorine is a chemical element in the periodic table that has the symbol F and atomic number 19. Name comes from the Latin fluere, meaning "flowing". He is a halogen gas univalent poisonous yellow-green is the most chemically reactive and electronegative of all the elements. In its pure form, it is very dangerous, it can cause severe chemical burning so associated with the skin. Usefulness
Fluorine and its compounds are used in producing uranium (from the hexafluoride) oral b 3000 and more than 100 commercial fluorine compounds, including plastics to high temperatures. Hydrofluoric acid to etch glass incandescent lamp. Reaction: Casio 3 + 8HF H 2 SiF 6 + CaF 2 + 3H 2 O. Fluorine hydrocarbons [Freon-12 (CF 2 Cl 2)] is used heavily in the air cooling in refrigerators and air conditioners.
The existence of fluorine as a soluble fluoride in drinking water exceed 2 ppm can cause spots on tooth enamel if consumed by children with permanent teeth. However, in smaller amounts, fluorine can prevent cavities. The materials are mixed in toothpaste heksafluoroksilikat Sodium (Na SiF 6).
Fluorine is also useful oral b 3000 for preserving wood (Natriun fluoride (NaF)), as an insulator (Sulfur hexafluorida (SF 6)), as a solvent in the processing of aluminum (Kliorit (Na 3 AlF 6)), as an ingredient in machine oral b 3000 tools (Teflon) , and so on.
iah ... fluoride also turns out one of the bomb-making materials. yes hopefully toothpaste we use fluoridenya oral b 3000 level is so low that we are not too much affected,,, wow really scary substance turns on this one ...
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