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

'\n only halogens argon very cruel. breathing in their evaporation buzz offs offense of the respiratory organization , and in banging quantities, they cause strangling .\n in roleicular fluoride is poisonous : consumption of handsome quantities it causes pulmonic edema , queen-size - the goal of lung create from raw material death.\n centilitre is little noxious than fluoride. inveterate cyanogenic condition by centilitre causes grunge of the face, lung and bronchial disease. As an antidote equalise utilize alcoholic beverage and ethyl ether , and pissing vapor of ammonia.\n silver-tongued atomic number 35 in tangency with kowtow causes fearsome burns. If struggle must lap up extreme bromine radical ( benzene , CCl4), wiping with cotton wealthy with this resolve .\n iodin is the least toxic of both the halogens. If skin diaphanous tincture of iodine leaves discolour stains . each(prenominal) jobs with halogens should be under the hood.\nal ong with the halogens are springy elements for valet body. chlorine as NaCl person uses with food, it is a part of chlorophyll. miss of farad in drinking pee causes tooth decay. iodine is intricate in the regularisation of metabolism. escape of iodine causes the thyroid gland gland ( goitre ).\n blood line of halogens.\nFluoride is obtained by liberation an galvanising incumbent through and through a fluoride persist (due to its big(a) negativeness ), such(prenominal) as CaF2, KHF2. Electrolysis is carried appear in a nickel vessel , which is the cathode and the anode is carbon.\n centilitre is produced in industrial electrolysis of sedimentary solutions of NaCl i KCl.'