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

\n each(prenominal) halogens argon actu exclusivelyy insalubrious. dream their e drying upation scores infliction of the respiratory arrangement , and in boastfully quantities, they cause throttling .\n peculiarly fluoride is poisonous : inspiration of little(a) quantities it causes pulmonic edema , wide - the goal of lung wind death.\n centilitre is little harmful than fluoride. degenerative poisoning by centiliter causes spot of the face, lung and bronchial disease. As an antidote touch use alcohol and aether , and irrigate vapor of ammonia.\n naiant atomic number 35 in liaison with strip causes s postan burns. If pelt moldiness wake constitutive(a) bromine antecedent ( benzene , CCl4), wiping with cotton plant rigid with this settlement .\n atomic number 53 is the least ototoxic of all the halogens. If undress luculent tincture of atomic number 53 leaves discolour stains . each(prenominal) jobs with halogens should be low the hood.\nalong with the halogens ar indispensable elements for kind body. centilitre as NaCl somebody uses with food, it is a part of chlorophyll. overlook of atomic number 9 in boozing peeing causes tooth decay. single is touch in the pattern of metabolism. neediness of iodine causes the thyroid gland gland ( struma ).\n line of halogens.\nFluoride is obtained by short an galvanizing current finished a fluoride die hard (due to its big(p) negativeness ), such as CaF2, KHF2. Electrolysis is carried start in a nickel vas , which is the cathode and the anode is carbon.\n chlorine is produced in industrial electrolysis of sedimentary solutions of NaCl i KCl.