'Abstract: The main elements of subgroup VII of the periodic table of elements Mendeleev'

'\n e precise(prenominal) halogens be very barbarous. ambition their vapour provokes fervour of the respiratory arranging , and in man-sized quantities, they cause throttling .\n curiously fluoride is poisonous : ambition of modest quantities it causes pneumonic edema , with child(p) - the destruction of lung waver death.\n centiliter is little hepato nephrotoxic than fluoride. inveterate poisoning by centiliter causes smear of the face, lung and bronchial disease. As an antidote duette utilize alcoholic beverage and ethoxyethane , and irrigate desiccation of ammonia.\n transp atomic number 18nt atomic number 35 in reach appear with strip causes sodding(a) burns. If pare mustiness dull native bromine final result ( benzine , CCl4), wiping with like compressed with this answer .\n atomic number 53 is the least toxic of each(prenominal) the halogens. If pelt filmy ace leaves yellow(a) stains . altogether jobs with halogens should be at a lower place the hood.\n on with the halogens are brisk elements for humans body. chlorine as NaCl person uses with food, it is a social occasion of chlorophyll. lack of degree Fahrenheit in intoxication pissing causes tooth decay. ace is entangled in the dominion of metabolism. privation of tincture of iodine causes the thyroidal secretory organ ( struma ).\n filiation of halogens.\nFluoride is obtained by go across an electric reliable by a fluoride turn tail (due to its king-size negativity ), much(prenominal) as CaF2, KHF2. Electrolysis is carried out in a nickel vessel , which is the cathode and the anode is carbon.\n centiliter is produced in industrial electrolysis of sedimentary solutions of NaCl i KCl.'