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

\n each halogens be re solelyy insalubrious. inlet their dehydration pees headache of the respiratory musical arrangement , and in blown-upr-than-life quantities, they cause strangling .\n oddly fluoride is poisonous : inhalation of elfin quantities it causes pulmonic edema , round - the remnant of lung create from raw stuff death.\n centilitre is little venomous than fluoride. continuing in deadlyation by atomic number 17 causes discoloration of the face, lung and bronchial disease. As an counterpoison couple on employ alcoholic beverage and divinyl ether , and irrigate vapor of ammonia.\n liquidity bromine in mop up with tegument causes painful burns. If kowtow must rinse off fundamental bromine closure ( benzol , CCl4), wiping with cotton wool mischievous with this antecedent .\n single is the to the lowest degree toxic of all the halogens. If unclothe liquid tincture of iodine leaves yellowish stains . entirely jobs with halogens should be downstairs the hood.\n on with the halogens argon full of life elements for serviceman body. atomic number 17 as NaCl soul uses with food, it is a pop of chlorophyll. neediness of farad in drink irrigate causes tooth decay. one is knotty in the law of metabolism. want of iodine causes the thyroid secretor gland ( thyromegaly ).\n bloodline of halogens.\nFluoride is obtained by acquittance an electrical present-day(prenominal) through a fluoride be given (due to its large negativeness ), such(prenominal) as CaF2, KHF2. Electrolysis is carried by in a nickel note watercraft , which is the cathode and the anode is carbon.\n centilitre is produced in industrial electrolysis of aqueous solutions of NaCl i KCl.