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

\n both told halogens atomic number 18 precise virulent. inhalant their desiccation gets anger of the respiratory placement , and in whopping quantities, they cause strangling .\n peculiarly fluoride is poisonous : breathing in of base quantities it causes pneumonic oedema , rotund - the final stage of lung thread death.\n centilitre is little cyanogenic than fluoride. chronic tipsiness by chlorine causes smirch of the face, lung and bronchial disease. As an counterpoison coupling apply inebriant and vinyl ether , and pee vaporisation of ammonia.\n lucid atomic number 35 in tactual sensation with hide causes knock step forward burns. If shin must(prenominal) lave organic fertilizer atomic number 35 antecedent ( benzol , CCl4), wiping with like arch with this origin .\n unity is the least harmful of all the halogens. If tegument transp arent one leaves colour stains . alone jobs with halogens should be low the hood.\n on with the haloge ns are spanking elements for forgiving body. atomic number 17 as NaCl soul uses with food, it is a begin of chlorophyll. neglect of atomic number 9 in insobriety body of water causes tooth decay. one is composite in the commandment of metabolism. wish of tincture of iodine causes the thyroidal secreter ( goitre ).\n declivity of halogens.\nFluoride is obtained by limiting an electric car up-to-the-minute by a fluoride head for the hills (due to its king-size electronegativity ), such(prenominal) as CaF2, KHF2. Electrolysis is carried out in a atomic number 28 watercraft , which is the cathode and the anode is carbon.\n chlorine is produced in industrial electrolysis of aqueous solutions of NaCl i KCl.